Here is the website I am using
www.wholesomefoods.com it has great recipes and food ideas
I have a baby food processor, so I cook it as the directions then puree it.
The foods you shouldn't use the left over cooking water are Carrots, Green beans, sweet potatoes, squash (there are some more but I can't remember, they are listed on that website)
These foods are high in Nitrates and when you cook them they are relaesed into the water, so you shouldn't use the water for thinning