R.E.
When my son played soccer, we always had fruit at half time. When it was my turn, I usually just bought whatever was on sale. Strawberries were always a big hit. I washed them and cut the stems off so there was no "trash." Those are on sale at Kroger right now. You can get two packages for $3.
For after the game, I always got prepackaged crackers like goldfish or cheeze its and a cold capri sun. One time, I made popcorn and divided it up into Halloween treat bags.