If your pH is 6.8 and your pool store wants to sell you PH Lower, then you need to run from that pool store. That makes no sense.
If your pH is 6.8, that means it could be lower than that since most kits don't show values any lower. You can use 20 Mule Team Borax (laundry aisle at Walmart) to raise pH. While you are at Walmart, get several jugs of generic bleach --- plain, unscented.
You will need stabilizer (CYA). How much depends on the volume of the pool.
Repost with more info about your pool -- type, volume, type of filter, size of pump. (Actually, use the link in my signature below to put that info into your signature so that it will make it easier for people to help you.) Once we have some more details, we can better advise on amounts of things you should add.
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