Buying lunch and dinner at the office. Related: keeping fridge stocked with drinks.

BUT I'm a cheap bastard. I wouldn't pay much over my own price of these things for someone to take care of them for me. In an ideal world it wouldn't cost me anything additional.

How that could work is if you could make an affiliate-style deal with restaurants to take 5% (or whatever) of their money.

Same thing with drinks. I buy them at a supermarket. You could buy them from a wholesaler and get them to me for the same price I normally pay.

To make these really big I think they absolutely have to be low-margin busineses. It's easy to do these kinds of business if you charge a lot but I think they could be huge if you figured out how to do it on a very low margin.