Well, you're a gutsy little thing to try your maiden backpacking voyage in the
Tx summer. :cool: Just tell yourself before you even embark that if things don't work out as you had hoped, then you'll give it another try under better climate conditions.
Stash a few gallons in your car just in case. And, yes, you can boil water to purify. Let it go a good two minutes at a rolling boil. You could also use iodine or chlorine dioxide tablets for purification. Bring a handerkerchief or bandanna to filter any large particles, silt or sediment.
Congratulations and welcome to the wonderful world of backpacking. You're gonna love it. :yes: (Well, maybe your first trip won't be the best....mine wasn't.....but you'll learn a lot.)