This is a great activity for preschoolers to do- they can measure out the oats and water while mom slices the fruit.
Place oats, then lemon juice or kefir, then water or milk and salt in a 1-1/2 quart crockpot. Do not use one that is bigger than 2 quarts, crockpots need to be 3/4 full to cook food properly without burning.
Add butter, fruit, and vanilla. Cover with a lid.
Turn slow cooker on low as you (mom) go to bed, oatmeal will be ready 6-8 hours later but can go a little longer if needed.
I like to have the children make this oatmeal while I'm making dinner, so it has a few hours to soak before we turn it on, this helps break down the anti-nutrients.