I also had a hard time getting enough PEG tube gravity feedings in every day. it seemed there were no minutes left in the day after my radiation, chemo, any other doctor appointments, and whatever amount of work I was able to squeeze in. First, I used a feeding formula that was calorie dense like Jevity 1.5 (1.5 cal/ml) or even 2.0 cal/ml stuff when I could get it. I would take two 8 oz cans with one can of water three times a day. It's a lot of liquid but I figured 3 x 8 oz = 24 oz and I KNOW I can drink two 12 oz beers. Doing it in three combined feedings/hydrations reduced the overhead of multiple feeding sessions because I would only have to setup, break down, and clean my feeding rig three times a day, plus another quick one I would do with just 24 oz of water, rather than 7, 8, or 9 sessions.