M.R.
I would be careful freezing glass, some will break easily, especially if it is not meant for the freezer. I have some pyrex that has done OK, but I would just be careful.
I used to freeze baby food that I made in ice cube trays, then I would pop them out and put them into plastic bags, but you could use what ever was safe. The ice cubes were about one ounce of food each, so it was easy to measure and get out of the freezer. You could microwave in a glass container to thaw and heat. I used some pam in the ice cube trays , but you could also use an olive oil spritzer too, I have one from williams sonoma that I love, and it is cheaper and nicer than pam.
M.