I love my hydration bladder systems, but I hate the fact that they take so long to dry. If you don't dry them, or fill them up with a weak chlorine solution, you end up with green, swampy smelling water in no time.
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Step 1: What'cha Need
Two wire coat hangers
Step 2: Step 1
Cut the hooks off of both coat hangers. Save one hook for later. Straighten out the coat hanger wires.
Step 3: Step 3
Slide some of the heat shrink onto the wires. Leave it a little on the long side and hit it with the heat gun.
Step 4: Step 4
Wrap the jaws of the pliers with electrical so you don't tear up the heat shrink while you're doing the bending. Bend the wires so that they'll keep the bladder open. Try to bend the ends of the wire so that no matter what the ends can't make contact with the bladder. Bend the hook up as shown.
Step 5: Putting It to Wok
Slide the wires into the bladder. Hook the hook over the drinking tube, and hang the whole thing up to dry.