Question about raising PH in soil

I have a plant growing in soil that is showing a soil PH of about 6.2. I was just wondering what I should use and how I add these materials to raise the PH to around 6.8. Thanks a lot!

i wouldnt bother mate the plants probly got used to it aslong as you are between 6.2 and 6.8 theres no need to pull drastic measures. but for future reference ( best at the start of a plant ) the cheapest way to adjust ph is vineger for down, baking soda for up.