How much rice in a bottle?

Jill • Pro-choice athiest ex-pat, mum of a beautiful boy born nov 2016

For those of you who add baby rice to bottles, how much do you put in?

*note* I'm not asking for opinions about whether or not to do it or the merits of baby rice. The 'empty calories' argument holds zero weight for me since baby rice here is fortified and contains lots of vitamins and iron, also unless your baby is overweight I don't think calories are a concern.