The only water near the start/end of each passage will be what you put there yourself, or MIGHT
be there, for public consumption, thanks to our heavenly trail angels.
You can contact the segment stewards before you leave, and find out what the water status is at that moment
I wouldn't bet my life on water being there, unless I put it there myself - and then, there's always the chance someone will take it.
Forewarned is forearmed. YMMV. Caveat Emptor. Above all, have fun!