I just want to get this out of my mind

At the fish and chip takeaway shop near my house, I saw they have a new sign up saying they're closed every monday. The guy who owns the shop told me about how they're not making enough money and hardly anyone comes in on mondays so it wasn't worth it to stay open. Then he asked if I wanted to buy anything else, a drink or something. I told him no, not today and left.
As I'm walking back home I start thinking that I should have bought a drink to support the shop, especially after everything he just told me. So I go back, specifically for that reason... but he's not the one who serves me. I saw him in the back, called out but he didn't hear me and someone else came instead. I could have just said I wanted to talk to Peter and I know that would have been fine. But I don't think quick enough in social situations, especially when they don't go like I thought they would, plus it might have been awkward. So I bought the drink and as I'm doing so I see him briefly at the doorway, so he saw me buying a drink.
So now it probably looks like I just changed my mind and went back for a drink only because I wanted one. Not because of wanting to support the shop.
I know a drink isn't much but it's still something. I do want to support the shop.
And I don't think I can tell him in the future what my intention was without it being very awkward. It doesn't seem like the kind o thing to do anyway. "Remember that time you told me that you're not making enough money? I came back to buy a bottle coke to help support the shop."
Yeah.... that doesn't work.
I'm sure he isn't thinking about it now.
I know I don't have any responsibility or obligation but I go there often, whether it's for a meal or a snack. So I guess I don't want to be seen as a regular who wont offer even a little bit of support for a place I go to often.