If you can't get hold of any liquid fry food then just crush some flakes reeeealy fine. Dont crush the flakes with your hands 'cos the oils /sweat etc on your hands prevents the flakes becoming fine enough for fry.
i use the lid of my flakes container and crush it with my thumb, hmm but platty fry are bigger than guppy fry arnt they so maybe they need to be crushed extra finely owell my fry are feed up so im not complainin