For immeadiate needs today or tomorrow...
A Brita or Zero Water filter pitcher or dispenser. Both of these can be purchased at WelMurt or on Amazit.
1) Brita Standard UltraMax Water Filter Dispenser, Gray, Extra Large 18 Cup, 1 Count
2) ZeroWater 20 Cup Ready-Pour Dispenser Water Filter Pitcher, clear
Either of these can be purchased for about $30. This will keep you in drinking water for the next month or two. You'll have to refill them several times a day, while emptying them into jugs for storage. You'll have some water for cooking and plenty to drink.
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Next, for long term needs it's going to cost a bit more but with a little creative thinking not as much as you might think. The stainless steel Berky stand-alone water filters cost about $300, even for a 2-filter tank. As you can see below you can get 2 filters for $65. You can then use food grade buckets or other stainless steel or plastic containers of your choice. Make you own tank. 2 Doulton filters can filter 3 gallons of water per hour.
Doulton filters are cleaned by scrubbing off the surface with a green kitchen cleaning pad. I've had 2 of these filters in a Berkfeld tank over 15 years, I've cleaned them twice. They still work great! When the filter starts slowing down I clean them. Doulton W9121200 7" Super Sterasyl Ceramic Filter Candle - Pack of 4
You can buy them from Amazit or other internet retailers.
Here is how to build a bucket system... Buckets don't have to stack neatly on top of each other. All you need is 2 food grade buckets. Put a couple pieces of wood on top of the first, set the second buck on top that you mounted 2 filters in.
https://preparednessadvice.com/an-inexpensive-water-filter-the-bucket-berkey/
Where to get food grade buckets or barrels? US Plastic corporation, they make any kind of bucket or barrel you may need and sell to the public.
They sell valves, tubing also.
https://www.usplastic.com/