Food colour is available in amy grocery store. Powder and liquid are good. I personally prefer liquid as u get very good quality one.
The best fud color i used is thst of Bush Fr veg non veg any dishes safe authentic has a long life too Gives correct shades in dishes as reqf in tandoori or tikka or biryani dishes asap
For cakes ther r gud essence available in gud quality store s all chocolate strawberry vanilla erc butter scotch too