I would cut the bad leaves off.

The shriveled ones to the right look too far gone to recover. Waffle plants definitely wilt if they get too dry. Good save!

I cut off all the yucky looking ones and all that's left is new growth. Do these plants grow that quickly? I see tiny baby leaves sprouting!

You need to maintain the humidity around this plant, or water often to prevent this from recurring. Do not let the plant sit in water though, it will rot.

You can speed growth of plant by using a weak fertilizer.

I found out the hard way this plant requires more water!!! Thanks Rose!!!