Mixed berries

Handful is non-standard; no spoon or piece conversion required.

Instead of Mixed berries

Strawberry
Use the same weight, hulled and chopped; reduce added sugar slightly as strawberries are sweeter and less sharp.
Red seedless grape
Use the same weight, halved; they are wetter and less tart, so add less liquid and a squeeze of lemon.
Canned pineapple chunk
Use the same drained weight, chopped; sweeter and firmer, so reduce sugar and cook a little longer.