[Grubbypaws]

My water butts are empty 

I am going to have to use tap water for my blueberries which I have never had to do before! I live in an area with hard water so I am hoping that I wont do too much harm. Is there anything else that I can do in this situation?

[JayG]

Found this advice from the RHS (https://www.rhs.org.uk/advice/profile?PID=691):

Ericaceous plants (acid-loving) are fine to be watered with tap water when rain water supplies have run out. However, over a long period ericaceous plants watered with hard water will start showing signs of chlorosis (yellowing of the leaves). Mulching with lime-free organic mulches such as composted pine needles or composted bark will help retain moisture within the soil and keep the pH low.

[Yorkshire Lass]

My allotment pal, says to put vinegar in tap water to make it more acidic, 1 part vinegar to 10 parts water.  I have not tried it myself but his allotment is amazing an very productive.

[JoshP]

I add vinegar, even to my rainwater, to help keep the soil acidic. This allows me to keep the pH about 5 quite easily.