Back seat water container and water purification

Tallyhoe: Do you have a method for testing the water to make sure it is drinkable? How often do you have to change filters. I think I understand what you are doing. The first filter removes the " chunks" so the second can do the purifying. What make and model of filters are you using? I would love to be able to use the ice maker and just draw water from our faucets. I have one filter housing in my utility bay and could easily install a second. I would like to filer all the water.

Moisheh