I almost never throw out a plastic container. If it’s a 2 liter pop bottle, it gets filled with water. If it’s a gallon or half gallon orange juice grapefruit juice container, it gets rinsed and filled. If its a gallon or 96 or 64 ounce laundry soap container, it gets filled. (hint with the soap containers: don’t rinse them! Now you have good, soapy water if U need it).
My ROT (Rule of thumb) is if it held a food substance when it was real, it’s potable water.
If it held soap or antifreeze or anything non-food, use it as washwater or flushing or whatever.
I must have 200 gallons stored and my aim is to get alot more.
You have two hundred gallons, that is commendable. May I suggest going to bakers and getting Teflon coated 55 gallon drums? In the 90’s we got them from a bread bakery. Perfect for water storage. As long as they are kept sealed, they should be containment free. Get some chlorine test tablets and use common pure bleach as a disinfectant. A few drops of bleach should show proper test results in a gallon of water.
Plastic containers have a recycling triangle on them with a number inside of it. This will tell you if they are food grade or not. It’s best to stick with slick plastics for water storage. There are not porous. Empty bleach bottles work great.
If you see cheap plastic tarps on sale grab a couple. Lay them out in the rain and get free water.
If you see cheap plastic tarps on sale grab a couple. Lay them out in the rain and get free water.