Can I use freeze dried fruit in a Sangria mix?
It depends on the fruit you use and whether you mind exactly how the end result turns out! freeze dried normally means berries, but they will turn to mush as they rehydrate, which is fine if you put some in a glass and drink quickly, but not good if you want them in a jug to soak up all the wine.

From personal experience, I find frozen(rather than freeze dried) oranges, apples , lemons etc work well as they stay structured, but I'd always go for fresh berries.