Pumping Enough Before Vacation

My husband and I will be on vacation June 22-29. Our son is breastfed and has only ever had breast milk. I had a good freezer stash until I went back to work and it has since dwindled. I try to pump 3 times a day, but what I pump is what he drinks while I'm at work. I try to stay hydrated and eat regularly. When I pump and according to what time of day it is I can get between 3-8 oz. I want to pump enough for him during the day and still stash some in the freezer. Any tips or suggestions would be greatly appreciated.