I bought one of these but, how do I connect it to an outdoor water faucet?

I want to use a RO system to fill a 55 gallon plastic water storage tank. Is the water line you hooked to the float valve the water line that would normally go into the metal tank of an RO system?

Your RO waste water line should still be pouring water down the drain if you're just turning off the clean water line going into the holding reservoir with a float.

Does this purify water or is it just an automatic floatation shut off? I’m looking for something to hook up to my sink faucet to purify the water specifically for my fancy goldfish

Will this enter a 5 gallon bottle? I was thinking of using this on my water dispenser