How do i properly bring down ph in my soil...?

I have some soil currently at 6.5. It's about 12 gallons or so. If I wanted to bring down ph to say 6 or 6.2 how much ACV should I add?

I only PH my water now. Since water effects PH you might as well make it your change-agent

mrCRC420 said:

I only PH my water now. Since water effects PH you might as well make it your change-agent

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I've thought about that too. My tap water is right at 7, so I will need to lower it a bit. Probably much easier than lowering the ph of the soil, especially when it is at the top end of what I understand the range to be anyway. Thanks