I hadn’t thought of vinegar with the water. LOL. Around here we don’t ‘think’ about making our soil acid. Mainly concerned with keeping in moisture while it’s so hot and dry and keeping down weeds. We got nearly a yard of pine mulch from a neighbor who had stumps ground down. This weekend’s chore is spreading it around the blueberries, raspberries, roses and maybe cherry bushes if we have enough.
We have some pine needles from our now almost dead Afghan Pines. I have not tried to rake them but that should not be hard.
I think the soil PH where I planted the blueberries is neutral to a little below neutral PH because of the natural rain drainage on that soil and it is sandy. I have 2 PH meters but they are stuffed away somewhere and I have not measured it.
I think the major issue is regulation of moisture and extremely strong sunshine, very hot weather and high dry winds.