If you need to use store bought potting soil, look for Azalea mix. It would be hard to grow in regular potting soil. The soli acidifier depends on bacteria, and it's hard to keep bacteria in pots. I do it with compost, and adding the bacteria monthly. But compost is neutral and I use a peat moss compost for blueberries. It is more acidic than most composts.
Vinegar works, but you must flush the carbonates out. Vinegar breaks down via bacteria and the carbonates become free. But if you water it heavy you can actually flush the carbonates out.
I use battery acid which is perfectly safe to use. Well for the plant, it is always dangerous to work with acid. Many myths surround battery acid. It must be pure acid else your batteries could explode. No lead or other heavy metals are in it. It's 30% Sulfuric acid, and safer than pure sulfuric acid. Sulfuric acid turns carbonates to gypsum which removes them permanently. Gypsum is very stable and neutral.
I have Southmoon too, and another 6 cultivars. It's best to have other cultivars as they are somewhat self fertile though they will bear more fruit with pollinators around.

Yes, you can add the soil acidifier, I do too. It's hard to keep the PH down, so I use all tools available.

You also need to use an acidic fertilizer.