My DS likes blueberry muffins from a box - its easy so don't judge

Anyway I thought I would try to add some veggies to it and saw online that baby food works well but I cant figure out how to replace the liquids in the box with the baby food - all the recipes I find are from scratch.

This is the liquid I add:

1/2 Cup Water

1/3 Cup Vegetable Oil

3 Eggs

any ideas on how to sub?