I don't see how you could puncture the Plastic Coleman bottle, or any plastic fuel bottle, IF you exercised some common sense.

Marlin55388 has the right idea, if you carry inside of pack.
I take a little extra precaution even in my outside add-on pockets.
I wrap my fuel bottles in thin foam material and secure with duct tape, sort of a fuel bottle Cozy ;)

You could do the same with traditional metal fuel bottles, whether stashed in pack or side pockets. A little extra protection from dings/dents.

I wouldn't worry about the Coleman 32 oz bottle leaking, even after you break the seal. I'm sure they figured you wouldn't be emptying it when you opened it, just refiling a camp stove of some type.

If it still worries you, get some cork gasket material, and make a gasket for the cap. Use the black auto gasket sealer or silicone. That will ensure a tight seal once opened.

Nothing the matter with the two burner stove, but as jjc mentioned, fuel consumption will be determined by usage and cooking habits.
I'd get the odd guy out to carry maybe another 32oz bottle, just in case.
I'd also pick ONE person to run the two burner (YOU) ;D

When I tripped with 3 other guys, we all had our own stoves. Problem was, I could count on at least two of the three too have stove issues, mostly from neglect/old fuel. Invariably, I would my stove and maybe on other one would be the ones cooking the meals and making hot water.

Two of the guys were helpless as far as cooking meals or camp chores.
They would run the stove at FULL blast and eat the fuel up as fast as I could re-fill it. I soon became the sole stove operator. I use a Peak 1 stove. It will run about 1 1/2 hours on full, 5 + hours on simmer. I seldom ever use anything but simmer or low. A few extra minutes waiting for water/food to cook is no big deal to me. Just means a few extra casts or some more firewood collected. The savings in fuel consumption is noticeable and worth the wait IMHO ;)