What about the etiquette of filling your water bottle at a store's soda machine? It's considered a faux pas by my riding group, though I see folks do it occasionally. I think a store operator once told us it was unsanitary. Maybe he had encountered cyclists who didn't take off their gloves, don't know. Do people take ice as well? Ask first? Offer to pay? I don't like plastic bottles but it also feels wrong to take something that the store has for sale. Thoughts?