Like, for example, say I was making a map with Lava in it, so I turn the water into lava and I get hurt when I touch it, but it obviously doesn't look right. Therefore I need a lava texture, so after I make one (actually if anyone has a good one could you show it to me?), how would I replace the regular water texture with the new lava one?
Basicly, me want blue water turn to red water.