Emergency Water Preparedness: Storage and Backup Filtration
Article Summary: Build an emergency water plan around stored drinking water first, then add a backup treatment option for suitable freshwater. Plan at least one gallon per person per day for three days, working toward two weeks where possible. A gravity-fed filter works without electricity, but it still needs an appropriate source and maintained filters.
YOUR HOUSEHOLD WATER PLAN
Store It. Back It Up. Keep It Ready.
An outage is easier to manage when you already know where your drinking water will come from. Keep a ready-to-use reserve, understand your backup filter’s limits and gather supplies before you need them.
How Much Emergency Water Should You Store?
PEOPLE × DAYS × 1 GALLON
A Family of Four: 12 Gallons for Three Days
For a longer reserve, the same family needs 28 gallons for a week or 56 gallons for two weeks. Add water for pets and individual needs.
| People | 3 days | 7 days | 14 days |
|---|---|---|---|
| 1 | 3 gal | 7 gal | 14 gal |
| 2 | 6 gal | 14 gal | 28 gal |
| 3 | 9 gal | 21 gal | 42 gal |
| 4 | 12 gal | 28 gal | 56 gal |
| 5 | 15 gal | 35 gal | 70 gal |
These are planning minimums for drinking and other essential uses, not a limit on what your household may need. CDC recommends extra for pregnancy, illness, pets and hot weather.
How Do You Store Emergency Water?
Unopened commercial bottled water is a reliable starting point. Follow its expiration date. If filling your own supply, use cleaned, sanitized food-grade water containers, label the date and replace the water every six months.
Keep containers cool, away from sunlight and chemicals. Never reuse containers that held pesticides or other toxic substances. See CDC’s storage and container-cleaning instructions.
A Filter Adds Options. It Does Not Replace Your Reserve.
Stored water is ready immediately. A filter depends on a usable source, collection containers, serviceable parts and time to produce water. Keep both layers in your plan.
What Happens to Tap Water During a Power Outage?
A power cut does not automatically make tap water unsafe, but it can interrupt treatment or pumping. Check your utility’s current notices. A private-well pump may also stop supplying water without power.
Follow local boil-water or do-not-use instructions. Having a household filter does not automatically override an advisory. Once a notice ends, use our after-advisory recovery checklist.
When Does a Gravity-Fed Emergency Filter Help?
A gravity-fed system can provide a backup when electricity or pressurized water is unavailable and suitable freshwater is accessible. Before buying, compare the model’s documented reduction claims, daily output, source-water limits, replacement parts and setup requirements.
Outback Ready OB-25RDY
Four-stage filtration without a power connection. The Outback Ready is listed for up to 24 gallons per day and nests together for storage.
- No electricity, plumbing or tools required.
- Designed for visually clear freshwater.
- Replacement filter kits available for continued use.
Keep the manual with your supplies and practice assembling the system before an emergency. Check current availability and delivery timing before relying on a new order.
What Do the Outback Test Results Show?
The published Outback-Plus NF test summary reports 99.9999% bacteria reduction, 99.99% cyst reduction and 99.99% virus reduction under the stated test conditions. ESP identifies the current Outback Ready with this NF filtration configuration.
These results describe the tested system and conditions; they do not mean any water source is suitable. Read the test-results summary and review Outback reduction claims.
Which Backup Water Sources Can You Use?
The Outback Ready is intended for visually clear freshwater, including streams, lakes, ponds, springs, collected rainwater and untreated stored freshwater. Clear appearance alone does not establish safety. Assess the source and follow the current system instructions.
Know When to Choose a Different Source
Do not use saltwater or water known or suspected to contain fuel or toxic chemicals. Do not assume filtering or boiling solves chemical contamination. Seek another water source and local public-health advice.
Pool and spa water: CDC advises against using it for drinking. Keep it out of your household drinking-water backup plan. Check CDC’s emergency source guidance.
See the Outback in Use
Practice Before the Power Goes Out
Learn the setup while you have time, light and access to the manual. Decide where source water will be collected and where finished water will be dispensed. Watch the Outback assembly video to see the system being put together.
Keep collection equipment separate from clean-water containers. Store the system and its replacement parts together so your backup is ready to use.
The field demonstration below shows an Outback system processing Mara River water in Tanzania. A visible change in color illustrates the demonstration; laboratory results provide the evidence for documented microbial reduction.
What Should Be in Your Emergency Water Kit?
Stored drinking water
Your household reserve, including extra water for pets and individual needs.
Separate containers
Keep untreated source water separate from finished drinking water.
Backup filter + instructions
Choose treatment for the available source and keep its manual with it.
The right replacement parts
Check your model and keep the specified filter kit with your supplies.
Your local water information
Save utility alerts, emergency contacts and your household plan.
KEEP YOUR BACKUP READY
Outback Ready Replacement Filter Kit
The all-filter replacement set for your existing Outback Ready. Keep a spare kit with your emergency supplies.
Emergency Water Questions
How do I calculate water for my household?
Multiply the number of people by the number of days you are preparing for, allowing at least one gallon per person per day. Use the table above, then add for pets and individual needs.
Can I store less water if I buy an emergency filter?
A filter should supplement your stored reserve. Without an appropriate source, intact filters and the necessary containers, it cannot supply water. Keep ready-to-use drinking water even when you own a backup filter.
Does the Outback Ready work without electricity?
Yes. Gravity moves water through its filtration stages, so it does not need an electrical connection or a pressurized plumbing supply. Use it only with suitable source water and according to the instructions.
Can boiling make any water safe to drink?
No. Boiling addresses germs; it does not make fuel- or toxic-chemical-contaminated water drinkable. Use another source when chemical contamination is known or suspected. Follow CDC’s emergency water-treatment guidance and local instructions.
Is the field-demonstration video proof that all river water is safe after filtering?
No. A field video is not a test of every source or contaminant. Compare the model’s documented performance and water-source limits, and use public-health guidance when choosing a source.
For a broader household plan, consult Ready.gov and your local emergency-management agency.
More Emergency Water Resources
How Gravity Filtration Works
Explore the four stages and the path water takes through the Outback.
Choose an Emergency Water Filter
Compare practical features for household preparedness.
Review Outback Performance
Understand published reduction results and their limits.
After a Boil Water Advisory
Find flushing, appliance and filter recovery guidance.
Understand Rainwater Treatment
Learn why collected rainwater needs a treatment plan.
