My west coast IPA recipe calls for using 2.5 gallons at the start for a 5-gallon batch. Can I just start with around 5.5 gallons, so I end up with 5 gallons at the end to keg instead of adding water later? I'm going to be using a 7.5-gallon kettle. Can I use beersmith to plug this recipe in and figure out what's needed to be changed, if anything? Thanks.