My partner and I will be thru-hike the AZT starting early March or very late February.
Hiking something this big with a stranger might be difficult as your hiking styles might be very different. I recommend hiking and backpacking with someone many times beforehand to see if they're a good partner for you.
800 miles is a long time to not be in sync with your companion.
My partner and I will be going South to North.
Check out the Arizona Trail App if you haven't already, I don't foresee myself using it because I'm so use to offtrail now and...well the AZT is a Trail...*shrug* but the app lists water sources, food resupply, side hikes, places of interest etc. Make sure you visit Kearney!
Resupply caches are not generally necessary, you should hike through a town to resupply once a week or so.
With the snow we've gotten so far this Fall I personally am not too worried about water. I will hike with a 4 liters between water stops. But that amount accounts for my desire to have tea every morning
I'll be wandering down from my Grand Canyon Haven for the winter and training on peaks around Phoenix, if you'd like to hike together this winter I'd gladly meet up. Just let me know