About anything will work, cardboard box, pet carrier etc. they need enough room to move a little, but not so big they slide around. they will most likely huddle together anyway. I like some form of bedding in the bottom to make it easier to clean. shavings, raked leaves, even shredded paper towels (we use those when shipping dogs they are absorbent, and no chance of entanglement). Take a small plastic bag and ask for a couple of cups of what they are eating now. and ask what it is. Doesn't matter, just nice to know and it will tie you over till you can get the feed you want. probably grower/finisher since they are only 8 weeks old. Tractor supply usually has it in 5# 20# and 50# bags, or you might split some with one of us.
Best of luck
RobertH
by the way. that was MY OPINION. not necessarily the most correct.