I would just use a small bottle that fits with TSA requirements. I also have gotten sample bottles ordered ahead of time to take. The TSA considers anything that "smears or spreads" to be a liquid. There is variation at different airports (I once got a small container of shea butter through one airport only to have it thrown out at another).
Get a small shampoo sample bottle at the drugstore or one of those bottles from the hotel-sized shampoo, etc. in your room. Refill with AS. You could also get a bottle at The Container Store or a similar B&M seller.