I just recieved my first real brew kit. I got the ahs belgian trippel extract kit. It says in the instruction to use either a 16 qt or 20 qt stock pot. I already have a stainless 16 qt. In my mind this seems to small for a 5 gallon batch. Can someone please tell me if it will be big enough or if i should get a 20 qt or even bigger? I know you add water to the wort once it is in the primary. I just dont know how much. I just dont want to have to worry about a boil over.