you cant put it back now that you have touched it. even if its mother does find it - she won't accept it back.
feed em worms or something, but if you really run out of ideas, get some kaytee baby formula for birds (hand rearing mix) but be warned - i doubt you can train them to shut up hahahaha.
oh. feed once an hour, every hour.
maybe if you're lucky you wont have to get up at 3am, to feed it.
5am will suffuce.
then you have to feed it every hour again.
dont feed it catfood- that is only for older birds that have plucked them selves and feathers are not growing back.