This is something that I did as a nanny years ago for a healthy (and wealthy!)  family. We would take organic fruit and puree it  in the food processor., freeze in ice cube trays, and then store in zip locks. The cubes can be taken out when needed and left in bowls to thaw. You could do this with frozen organic corn and peas, peaches, etc. You can just do batch after batch, make a big mess and then pop them in the freezer.
There is so much scary stuff in food, and babies are so precious, good for you for sticking to your convictions. You can also take organic oatmeal and process it in the blender to make your own instant for the babies. Bananas are fairly cheap. Organic potatoes. Sweet potatoes. Anything soft and pure – voila – baby food!

I made my twins’ veggie purees most of the time.  Just steam or boil a batch of veggies until soft (but not losing color), pop into the food processor (I have one by KidCo that is small and works great) with some of the cooking water to make it thin enough (you can reserve it and then adjust as needed).  You can store it in tupperware to use soon, or if you make a big batch freeze it in ice cube trays, store in freezer bags and serve as much as you want later.  With root vegetables, my ped advised not to use the cooking water, I think because of nitrates.  To make prunes, just put the dry prunes into the processor with some very hot water and puree- you can also boil them to rehydrate if you want.  Buy big jars of applesauce or steam or bake and then puree your apples.  I usually just mashed or pureed fresh fruit rather than cooking it. 
As for Baby Einstein, you do what you have to do!  Do they like music?  It will be easier when they can sit.  Do you have those exersaucers/ jumperoos for them?  My girls loved those and would hang out in them playing for a long time.  Good luck- you are doing so amazing balancing your life!