Can you acidify tapwater?
I've got some blueberries in ericacaceous compost in tubs. Unfortunately because we are in rented accommodation I can't put a waterbutt in... so I have been watering with tap water but I know this is not ideal. This might be crazy but could you, for example, pop a capful of vinegar in to acidify the water? Or am I better off continuing as I am and replacing the compost next year? 🤔