Jim- Hydration bags are a great idea, they come in a variety of sizes but also a variety of quality, Camel backs and Platypus are pretty different. EMS had a great sale recently on the Camelback. Check out a local outdoor shop for the pro's and cons of different materials, ease of cleaning, durability, type of nozzle and hose etc. You can put other imbibments in them too: Wine, OK. Beer, not
Got beer? Install Hatch Cover Kits and outfit one with a Fat Cat Bag. From what I have seen of your handiwork, installation would be easy for you. The kits come with everything, including clear silicon to do the job. All you need is a drill and a saber saw with a fine (like a metal cutting) blade. Oh yeah a dust mask. Heck, if I can do it, anybody can do it.
The Fat Cat Bag will hold a six pack on ice easily. The standard Cat Bag is nice too for your keys, cat tool, your cat, whatever....OK NOT your cat
I recommend four total hatches. One pair ahead of the front crossbar, usually in the spot that delaminates up there (killing two birds with one stone- new hatch, no soft spot). The second pair of course behind the rear crossbar.
There are a couple added benefits of putting ports fore and aft in each hull.
1) You can now inspect the hulls from the inside out. This is the only way to truly tell how thin your keels are getting by how much light is coming through
2) You can access and inspect the stanchions and repair little stress cracks that may develop.
3) Dry Hulls!! With the hatch covers removed fore and aft, air can flow and dry the hulls. If you are towing the boat on a dry day, this works really well. Remember- a dry boat is a fast boat.
OK, enough chatter, let's sail!!