Hi Tessy & welcome!
The soy milk is probably ok, as long as it doesn't have added oil. However, if it's Silk brand or one of the other brands with a lot of "fake" ingredients, next time try one of the brands that has a simpler ingredient list. My personal favorite "milk" is actually almond milk (Blue Diamond Original Flavor Unsweetened).
Our family's favorite pinto bean recipe is ridiculously simple. Sort & rinse a bag of pinto beans. Cut up an onion & crush a few cloves of garlic. Put it all in a large crockpot. Cover with about 2-3 times the height of the beans in water, and cook on low overnight & thru the next day (add more water in the a.m. if needed). Good by themselves, or add various spices & veggies as suit you.
Tons of great recipes at
http://www.fatfreevegan.com, & you can search by "pinto beans" to see what she has. The vast majority of them are McDougall-friendly.