Wow! It should be called CheapSkate Shack! We are obviously regulars here (ashamed to say Dukedom) and they wouldn't let us have a water cup...basically accusing us of trying to steal soda. My daughter drinks water or soda. If she wanted soda today, we would have bought a soda like all the other times before. But to hassle regular customers about a stupid water cup is RIDICULOUS!!
Being the greasy dive you are CS, you will attract the less than savory crowd who take advantage of water cup privileges. Solve the problem without insulting your regular paying clientele!
Also from the lack of cleanliness in your dining area...you could do for a health inspection.