Lot's of ideas out there, and I've tried many - but here's the best solution that I have found:
The camelback sits inside of the soft-sided roll on cooler, mounted on the back seat, so when it does need to be filled, I just zip open the top and pull the bladder out with the hose attached. I've only ever had to fill it in the middle of the day twice - once on my State Capitol ride when we rolled into Phoenix at noon and 104 degrees, and the second time was on my return leg from the 4 Corners Tour when we were on I-8 and rode into Tucon at 112 degrees. I start the day with a 6 pack in the bottom, the full camelback next to it and a 8 to 10 lb bag of ice on top of the beer and next to the camelback. By the time I am in need of my first sips the water is ice cold. I use a long hose, and if its not real hot, just leave the end under a bungee around the tank bag to keep it accessible. When it starts getting north of 90, the bite valve stays in my mouth so I can sip as needed. Like I said, I rarely empty the 100 oz in under 8 hours.
I drain the melted water from the cooler completely every morning and repack with ice from the hotel ice machine (I use a waterproof camping bag to fill with ice from the ice machine and transfer out to the bike), or if I need to buy more beer, I just wait till my first gas stop and puy the beer and ice and re-pack then.
On those hot days, I do blow back to keep the hose empty, but I don't find it too much of an issue.
Pros:
Easy to fill though rarely need to outside of the hotel. ICE cold all day long, and the big bonus is by the time the day is getting hot enough that I might need to wet my shirt under the mesh, I have an ample supply of melted ice water in the cooler to just dip the shirt in or just open the bite valve and squirt the cold water onto the shirt, and I get additional storage space on the outside, and top of the cooler, and if need be "refrigerated" space inside.
Best part is I always end the day with an ice cold 6-pack, even if I land in a "dry county"
Cons:
Looks like the Clampets riding down the road ;-), and not the lightest weight rig, but certainly not excessive.
Does make accessing anything stored under the seat kind of a pain to access, though I can remove the rig in under 10 minutes and I don't keep anything but my portable air compressor under the seat.
It will "sweat" and drip water onto the seat after multiple days, but I managed to arrange the rig now so when that happens it drains off behind me so I'm not sitting in a puddle (though some days that felt great!)
Just another idea, but one I have used now for about 5 years and haven't found anything else that work as well for me. The pic is obviously my 1100 but I use the exact same setup on my 1300 now too., just didn't have any good pix.
