Can you drain out fluids through a PEG?

I'm not sure how to word this, I'm supposed to be drinking more just to use my swallowing muscles so I don't lose them, but I react so much to fluid intake I've been struggling to drink as much as I'm supposed to. Until I figure it out, is there a way to drain out fluids after I drink them? Like, if I drink some water and then leave my Peg open can I drain it back out again? Or would I be losing too much stomach acid and other stuff? Does my stomach need to be empty for it to work? I feel like I've seen people do this but I'm not sure if there's anything special I need to do or if it's even possible. Thanks!