If you pay they’ll even slice mineral water for you.

Depends on how cranky the deli workers are. I had one look at me sideways for asking them to slice chicken breast for me.

A deli in a supermarket? In some of our supermarkets there is someone who slices fruits and vegetables. They slice fruit all day actually. It is a nice service. It’s over in the produce section, so I would ask them. The deli does slice vegetables for the salads they make and the extras for sandwiches, so yes, I would think they could cut fruits also if asked.

Yes as my store also sells sliced fresh fruit in bowls.
They do it anyways, so why not?

They can, but will they? Most stores already sell packaged sliced fruits. And if they will slice them at the deli just for you, they would of course charge you, I would say. Most delis serve special order party trays with sliced fruit, so I guess just order one of those, if you want a lot.