[Edratman]

There are 3 forgable items for supplies, the summer sword (100), the bag of wine (50) and enourmous broth cauldron (100). All require nature. The saving grace of this is that indy nature mages are usually abundent. You may have to empower one to level 2, to get the wine bag. Forging the rose (+1 N)with the level 2 mage will get you the ability to make the cauldron. The summer sword requires N2 and E1, which if you don't have in your nation mages, will probably require an indy enchantress.

Also most recruitable mages and priests give a small supply boost, about 10. This is a tough way to feed your armies.