>>1547512>getting a waterfilter so you don't need to carry a gallon of water each timeFor AZ I'd recommend both. You'll still want to carry at least 3l of water on you any and every time you go /out/ in AZ with or without a water filter imo, preferably with one. 3l per day you intend to be /out/. Even in the cool high mountains and for short day hikes more than ~5 miles. Unless you're camping right next to a water source with your vehicle nearby.