Smitty, Don't be shy about experimenting with the soda mixtures. It doesn't take much of chemicals to do the job. Use warm water to make it even more effective.
I live by my peg tube, in fact I'm "eating" right now while typing to you. I grab a big can of Progresso roast beef and potatoes, dump it in the blender, add a can of water, and blend it on high for several minutes. I pour it through a kitchen strainer into plastic jugs and pour it through my peg.
Check into the meal replacement drinks like Ensure, Jevity and others. Get the high calorie version. I buy the generic Equate at Wal Mart. Carnation Instant Breakfast makes a good meal replacement with whole milk. Blend about anything, add lots of water or milk to help thin it. Strain it and pour it in. Bon' appit!!
Be strong, Tom