Tampons are designed to be very absorbent, so they make a good wound-dressing.

Another ''stupid'' question: If you use a condom for water storage,
does it matter if there's some sort of lubricant on it, or not?

I'm glad some people are still replying on this thread.
Since my original post I made some changes to my survival tin:

-The utility knifes have been replaced by scalpel-blades.
-The 'waterproof' bags are replaced with a single Ziplock.
- I managed to add 3 meters of cord to the kit.
- also added a P-38

The ''signal mirror'' isn't replaced because a propper one is to bulky for the kit and because I also carry a small mirror in my EDC.

I have also made another survival tin, with similar contents as a birthday-present for my dad.

Any plain water-based lubrication probably wouldn't hurt, but it would be gross. And you certainly want to stay away from any spermicidal ones with N-9 or chemicals on it... same goes for ones with "heating", etc.