Make remover wipes
Stain remover pen
Oil blotting sheets
I also made the sewing kit. I had originally purchased one but realized that I could make one that didn't include tons of unnecessary stuff. Plus, I learned the hard way that the thread in those little pre-made sewing kits are awful. I cut a little card, made notches along the side and then wound good quality thread around the card. The needles slipped into the little slits in the card and the buttons (Don't we all have a million of these rolling around our house?) are held in place with a little double sided tape. Don't forget a handful of safety pins in a variety of sizes! These are all things I had on hand in my sewing supplies. Easy! And it all fit nicely into this tiny envelope.
Other suggestions that didn't make it into this kit were scissors, nail clippers, eye drops, hairspray and a small mirror. Take a stroll through the travel aisle at the drugstore or visit the make up section at Forever 21 for ideas. Is there anything else that you'd include in a day-of kit?