Watcha gonna slice off that buffalo steak with? You don't have knives.

Watcha gonna cook that steak with? You don't have fire.

Watcha gonna carry that water into your cave with? You don't have pottery.

You don't have technology.

Don't think those things are simple, either. Go out into the local woods and try building yourself a fire without matches. Try making an arrowhead. Try making yourself a stone knife. Try making a clay pot.

Good luck.