I can try.
you won't look like a zombie but you'll bloat, that's what water does to dead bodies. So,some trying to get you out of the bath while taking samples of said bath water is a nightmare. Slippage of your skin usually goes first in water. You know if you've ever been in the bath too long and your skin crinkles, that's what happens. If you are left too long the decomposing is awful.
not trying to put you off because it's your choice but try and get someone to find you pretty earlier on.