I can't believe you still have 30 5 week old chicks in the house! I only have 15, and at that age, I had mine out in the coop for three weeks and changed to a 16 lb hanging adult feeder and 5 gallon adult waterer. They eat and drink SO fast it's amazing to me... and I'm still not used to it. They are now 7.5 weeks old and I think I might run out of feed before my next shipment comes because I didn't think I needed to reorder so soon!
It sounds like yours will be fine. They got to drink so all is well. I'm sure they can go a few hours without food, so that part is not a worry. Don't beat yourself up! We're all learning as we go through this (all of us newbies, anyway). I just think this was a good way to tell you that it's time to get bigger waterers and feeders!