How do you feed the poor things!?! When I came back with what they wanted it was something different. What do I do?

You're probably taking too long to come back with the item. I don't know what the time limit is though :x

Oooh, okay, I'll be faster. =D Thanks!!

You may just have been unlucky. I think the item they ask for changes every five minutes (not absolutely certain about that though). Within that time frame, you can give them the same asked-for item as many times as you can.

I keep trying but I simply can't get them fed. Oh well. I dunno how to do it any faster. Thanks anyway.