As Fin and Fur said, any soft fruit will work. Also any high proof spirits. Just that so far as I'm concerned it ought to be GIN. I like my GIN cos it makes me SIN. . . . Ahem. Yeah, any soft fruit, left to soak in a 70 proof spirit, will infuse loads of alcohol, taste WONDERFUL, and rot yer teeth. Like I said before, add sugar and brewer's yeast to the mix and it will be LETHAL come Christmas. But at least you'll die with a smile on yer face . . .
Ric