I lived off of nothing but canned preparations that are medically designed and balanced for nutrient. You are likely not going to improve on that right now. When he gets to the point where you can make him blended smoothies you can do what you want. Just be sure your docs know what you are giving him. Even vitamin supplements, some of them are not good to be getting during radiation, chemo, etc. as they impact other things in patients, that are not problems in the normal population. Run some more soda through that PEG it may take many forced bubbly flushings to really get it cleaned out.

If they haven't told you, he should have it sitting up, food at room temperature, and stay sitting up for awhile after feeding, or he can get nauseous easily. Also for many people including me, having the drip rate too high made me want to throw up. Add at least two cans of regular water to three cans of ensure in the bag, so that he stays hydrated, and that also thins the solution for easier cleaning out of the tube.

Holiday weekend. Had hoped to see more people offer you their suggestions on this as all people deal with the PEG a bit differently.