A., I am in the same boat! We use Neutramigen from Enfamil for formula. For jarred food most of the stage 1 gerber and stage 2 gerber are ok as they are mostly a one veggie or fruit ingredient, keep an eye on the ones that start mixing more flavors like the vegtable beef dinners. Beachnuts ham and pineapple is ok, theres a chicken and sweet potatoe and a turkey and sweet potatoe that are ok, as well as apples and oatmeal, pears and oatmeal, a macaroni vegtable, all soy and milk free. For the Puffs the Sweet Potatoe Gerber ones have no soy or milk and the Target generic bannana ones have no soy or milk. Gerber graduates have jarred apple chunks and carrot chunks that are good for snacks.I found a Maple Arrowroot Cookie in the babyfood isle at Hannaford soy and milk free made by Healthy Times Organic Cookies. A-1 Market in manchester had arrowroot cookies as well that were ok. The Gerber freeze dried apples, pineapples and banannas are all soy and milk free. There is a bunny shapped cracker at target made by Annies that is soy & milk free as well, its like a bunny shaped teddy grahm. Barilla pasta in the yellow boxes (i think its wheat pasta) is soy & milk free.
There is food out there, its just harder to find.Alot of what I found was organic stuff. Also for the milk they will somtimes say Whey not just milk. Out GI told us that "natural ingredients" on a label is usually milk as well.
It is a hard diet to follow, I did it while breast feeding and my 9 month old is still on it, but it is do-able.
Good Luck!