I just chunked this into the evil.cfgHey now. That is an awesome thing. I could never get that to work correctly. Mind posting that code and I will include that in the next update?
recipes.addShapeless(<373:7>, [WaterBottle,WaterBottle,WaterBottle,WaterBottle]);
recipes.addShapeless(<5260>, [<5260:*>,<373:7>]);
373:7 is an item called "Clear Potion" from vanilla minecraft that has no potion effect and has no default crafting recipes. If you drink it, it gives you 10% hydration back like normal water bottles.
5260 is the camel pack (at least in v1.0.7 where I was testing this) and if you put an asterisk (*) for the damage value, it will let you craft that item with any damage value in the crafting recipe. I was also thinking you might want to add something additional to the crafting of the clear potion like more glass or thickened glass or something, cause you are crafting 4 bottles of water into 1 bottle, it would make sense if you needed more glass cause you are making a bigger glass? I don't know, just thinking about it in a RPG style. Like:
recipes.addShapeless(<373:7>, [<4094>,<4094>,<4094>,WaterBottle,WaterBottle,WaterBottle,WaterBottle]);
4094=thickened glass from extra utilities to make it a little harder to get to the point where you can combine water bottles into one? Or maybe you can come up with a neat idea so that you need a little bit of infrastructure first before you can start combining waters. Just a thought.