I don't know what to think about the potion belt. I guess if in your game all the potions come in some sort of standard bottle format, you could have that sort of easy-access holder. I always picture potions as being in irregular bottles so you can easily tell them apart from one another, which might complicate things.
I stole some House-flavor from a previous DM in that potions are not held to the 'liquid in a bottle' format (but often are found like this). His reasoning was Snow White's apple...the witch didn't give her a poition to drink from a bottle, she brewed the potion and put an eye-drop of it onto an apple. So in-game players would be given the gift of dried apricots from the elves that function as cure light wounds potions. "These apricots stave infection and promote rapid healing." Or the cleric that oversees a band of dwarven caravan guards hands out some kind of strong tasting chewy confection that they pop into their mouth before combat (Taffy of Bull's Strength). It all works exactly as the potion, but instead of one ounce of liquid it's been expanded to a comparable amount of any ingestible substance.
