You've got the whole DI/aquarium water bit.
Your confusion with the drinking water side comes from (I think) the fact that you have a "basic" kit. The line you see going out of my taste filter up towards the top of the sink ends with a drinking fountain-style faucet. The clear line you see come from the bottom of the picture and into the "in" tee of the taste filter is connected to a holding tank. With the faucet on one end and the tank on the other, the system remains closed and pressurized until you turn the faucet on.
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