Way to go Jim, pic the projected hotest week of the yr.
Be careful, if you don't have a Camelback drink holder, rig up a bladder for your tank bag and get a flexible clear tube at the hardware store and make your own.
I have used an insulated nylon lunch box that is flexible and foldable. I then took a 1 gallon Zip-Lock bag and rigged up a hose, sealed it and fixed it so I could open the back edge and add fluids when needed without pulling out the hose. Dump the water and add more ice into the side of the box and your good to go.
Keep us posted, and be safe.
Greg