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. :A1: 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!