Help! Chicks arrived in poor condition

Our chick order took a full 24 hours longer than expected to arrive from TX to our home in rural MO. They were on the road for 50 hours and we had snow last night. When I opened the box of 31 only 7 were standing and chirping. I hand warmed a couple on the 20 minute ride from the Post Office then quickly got everyone under the light once we were home. I took them out of the box to get drinks as they came around. Several that I thought were dead were actually breathing and once warmed and given a bit of sugar water made rapid improvement. So, I have 18 who are eating, drinking, and walking around and I have two that are alive and improving, but still very weak. I have those two in a separate brooder so they can rest and not be trampled. I am helping them drink a little sugar water every hour or so. Is there anything else I can do to help them recover?

 

Thanks for the suggestions. I will mix them up some food as that is my biggest concern. They aren't eating yet, but they are starting to move around a bit. Keeping my fingers crossed.