No, thank you, for making me cry

The water here in the Phoenix area of Arizona tastes like..... well, it takes like water, or rather water from a muddy puddle. When I lived in Oregon the water tasted great. The water that came out of the hose was clean, cold, and delicious; on the flip side, I don't like touching the hose water in Arizona with my bare hands. I used to laugh at "Hollywood" buying their bottled water and how stupid and wasteful that was. (They could drink from the hose like the rest of us) (let's keep in mind that I lived in OR until I was 11.)
I now own a water cooler and fill my 5-gallon jugs of water at one of the many local water stores that sprinkle the area. A water store is generally the smallest store located in a strip mall and in addition to offering water treated to reverse osmosis, they sell: pop, ice-cream, and assorted candies. I walked in and was immediately greeted like a king. They took my jugs from me, filled them and then profusely thanked me for my business. "Thank you so much for your business, we really appreciate it," the owner (I assume) said with a puppy dog face that looked only seconds from breaking down into tears. A sign on the register said that debit would only be accepted if the purchase was more than 3.00 and for the first time in my life, I really felt bad for not having cash. I bought 3.35 in items and felt awful that this poor little shop that was in obvious dire need of my money would be charged by a company because of my use of a debit card.
On a side note, my favorite taqueria is going to be shutting its doors in less than a month because I am the only person that ever seems to go there.
I don't care if McDonalds has to close a couple of its rat hole locations, or if the Wal-Mart stock goes down a couple of dollars, but when local businesses struggle, I do feel bad; it just feels more personal. I wish I could do more to help these companies, but there is only so much water I can drink, and only so many tortas that I can stuff in my mouth. So, to the extremely grateful shop-owner, thank you for your thanks, but you really just made me want to cry.