I've made a simple, raw shrub with blackberries. 1 part each of mashed fruit, raw
apple cider vinegar and sugar. Though I try to reduce the sugar a bit, and it still works with the vinegar. I let it stand in a jar for a week or two or three, according to memory, strain, add about 2-3
tsp citric acid per roughly 3/4 litre. No sterilising, no boiling, no mould, no alcohol. It is very concentrated and you could probably dissolve a penny in it. To drink, I use about 1cm of cordial in a tumbler and fill up with water. It is still fine at least four months after bottling. When I say bottling, I mean chuck it in a bottle and put the cap on. It would probably work just as well with other berries, but not sure about more pulpy fruit, as not tried yet.