Walmart has chlorine test ...

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Walmart has chlorine test strips with the supplies for spas and hot tubs.  $7.95 for 50 strips.   Use chlorine laundry bleach and figure out how to mix the tank.  A flow of compressed air bubbles such as large fish tank aerator will work for mixing.    Add bleach in small increments and mix.   For drinking water you want to keep the residual chlorine between 1-2 parts per million (or milligrams per liter.)   This will achieve disinfection.   Also follow advice of Phakee Engineering to get small household water filter.