I am going to make a starter for a 10 gallon batch i'm doing this weekend. Haven't done this before so I'm not too familiar with the starter calculator here. If I add 7.2 oz of DME, how much water do i need in a 2L flask? I plan using 2 liquid yeast packs to meet the requirement. Does anyone add hops to their starter? The recipe only uses Perle hops and I bought an extra ounce just in case.