Many years ago I had an adult bull snake get loose in mid-November & I looked everywhere without success...I felt horrible, guilty & worried sick about her.
Six months later I walked into my kitchen one night & there she was on the floor, none the worse for wear, after having brumated under a kitchen cupboard
to which I had no access (or any reason to think she got in there, besides the basic process of elimination). Mid-May she was done with her snooze & ready
for lunch...knowing that she was chilly but not so cold as to preclude movement, I suspect that she managed a few drinks* of water from the kitchen sink just
above her hiding place during her absence (likely at night when I wasn't looking), but she wouldn't say for sure...(*like from a dish left to soak?)