i'd tap that
If you say you’d tap that, it means you want to put a tap in a river just to get free water. Like you’re so thirsty, you’d tap the river even if it was full of mud.
I’d tap that if I saw a river of soda and it was free.
That lake looks so refreshing, I’d tap that if I had a tap and a ladder.
I’d tap that river if it had ice cream instead of water.