The following things are "infinite" if you forbid exploration into new areas: * Water * Lava Flows (Sources are finite) * Wood/charcoal: if you have enough s

The following things are "infinite" if you forbid exploration into new areas: * Water * Lava Flows (Sources are finite) * Wood/charcoal: if you have enough saplings and dirt. * Cobblestone: if you have lava and water in the correct arraignment * Wheat: if you have enough seeds and dirt * Fish: if you have water * Neutral-Monster items: for those monsters you can breed if you maintain the habitat * Aggro-monster items I believe that's it