[Suicide Junkie]

Just two supply types would be plenty. Energy-supplies & Matter-supplies, as Baron said.
Then you have solar collectors for energy supplies, and ramscoops (which use lots of energy supplies to function) for matter supplies.

Then you could implement some really cool stuff.

But, one thing that must be done is PREVENT AMMOLESS WEAPONS FROM FIRING! It is really kinda dumb when I'm outta supplies, so I can't move, but I can still fire 10 Massive-mount WMGs at the same time!