Even though I'm a northerner I use a drinking system. The one trip I didn't bring it with me- my trip to Moonshine, because it was cool...turned out to be a mistake. On my long route home after Moonshine I hit very high temps and really wished I had it with me! Mine is a off brand similar to a Camelback, but I really want to come up with something larger. I think this one holds 2 liters, and in hot/sunny weather I would empty it before the gas tank of the KLR ran out. I would pee maybe every 3 fuel stops...not nearly enough. If I drank at every fuel stop, I could drink a liter of water and still not get half the hydration I was getting by using this. I get continuous hydration while I ride rather than saturating myself during a stop, then stretching it in between.
I'm a big guy, and the backpack-style system doesn't fit me, especially with riding gear. I found a way to strap it to my top box using just the straps from the drink system. It worked great, and one click of a buckle and the straps come off so I can open the box. You can't see it well, but you can see it in this pic-
Jim