Are you near a metro area? A lot of them have foodbanks and homeless shelters that can give you a few things to help you get buy. Hygiene products, food vouchers, other non-perishables. They'll also have some probable contacts for you to get some more stable shelter, a job, a drinking cessation program or two that you can join that wouldn't be AA, etc. I know sometimes they get a bad rap on the internet, but there really are a lot of good religious centers (churches, mosques, etc.) that can offer similar resources and they won't try to push God on you. Don't be afraid to ask them for help if you're really in a pinch, even if its just to say, "Bro, can I get a Pop-Tart and some crest?" https://www.reddit.com/r/homeless/ <--- Probably has some good resources.
Is it a nice hotel? If so, head to the front desk. They often have toiletries for guests. Just double check to see whether or not they'll charge it to the room (I don't know if the group that's helping you out would take too kindly to extra charges on top of the room rental).