I don't carry fresh food except for the first day: weight and spoilage.

You might have success chilling berries in a lightweight container and carying them buried in your pack, using them the first or second day, bananas eat day one to two orm maybe, three. Apples should hold up longer.

If you are more concerned about the enzymes in fresh fruit, consider making leathers, dried at 90-100 F. I think temps in that range will allow enzymes to survive.

CM