The bar is a location you can visit. In here there will most likely be a person who is ''drunk on soda''. If you feed the person one food, the person will follow you and you can recruit him/her later. The bar is also the only location where you can find a bottle.
If you have a dog in your party, select the dog and you will get a special option to "lick the drunk person's face" this will wake up the drunk person without wasting a single unit of food.
If you have somebody with high medical in your party, you will be able to skip having to give the person food by 'reviving them with medical skills', but it costs medial supplies.