Simple pH solutions?

Hey everyone,

I recently just bought a pH meter, about time too. Can anyone suggest simple solutions to decrease my pH a bit? I dont have pH up or pH down at the moment. My plants are'nt showing symptoms yet but im worried that if left alone, it might cause me more trouble. My pH right now is at the low 7 range. Im trying to bring it to around 6.3-6.5. Im using a soiless mix of coco peat, moss, vermiculite and pearlite.

Look up using Baking Soda and Vinegar

I wouldnt trust the PH reading from that.
Iv got one the same and it always reads higher PH then what I really have.
My one read PH7, Then I got a proper PH pen and it read PH5.8 as the run off.

Dont use vinager i did and almost killed my plants also 7 for a ph isnt bad at all mine is always 7.2 i never had a problem with it