I think it would be more efficient and cheaper to even invest in a cheap brand of lipstick versus dying your lips with food products.
Sally Hansen and Physican’s Formula have organic makeup out now including lipstick. Try them.
pomegranite seeds will stain your lips as will rubbing a popsicle over your lips as you eat it.
Add clear gloss afterwards and it will look so cool.
Cherry Kool-aid and vaseline — blend it together with enough kool-aid to have a bright color (or light color, whatever). It’s cheap, vaseline keeps your lips moisturized and it tastes good