I've only done sloe gin once and it was delicious - got teh berries when on holiday, just don't have any here.
I used cheap gin, covered berries with it after pricking each berry twice. Add sugar to taste, shake every day for a month then strain, and enjoy.
Same procedure with any spirit and any berry I'd imagine
Many of the supermarkets have Kilner type bottles, ideal for filling and labelling for gifts for christmas