4 week vacation...
ATO container large enough to last you thought that time.
one of our neighbours empties our mailbox, and puts it on out table.
i have "pill boxes" with days of the week on it, and fish food in half of the compartments.
last time i didn't do this, and they overfed the tank.
you could lavel some frozen cubes with dates.
but honestly, i don't have anyone feed the tank when i'm out for less than two weeks. the fish will survive
they'll find pods and algae to munch on.
J.