What could i use to lower my water's ph level it's between 7.5-8.0

I found this list, I'm looking for household stuff to use until i make it to the store.

pH - Wikipedia, the free encyclopedia

I couldnt imagine adding cola to my water....... or even beer.
What about coffee or tea? seems a lil whacked to me.
Dyranty Reviewed by Dyranty on . Poor plants in bad shape, and I dont know whats wrong. OK I am "calling all cars" - I need some serious help. I have no clue what wrong with this crop. :( See pics below. I am raising them identically to my last crop which is flowering but looks pretty good. These look so sad. wtf4: I checked PH and it looks alittle high, on or above 7.0 so last night I added a sqeeze of lemon juice and 1 tsp of epson salt to help the PH and add some MG. They are in an airconditioned closet in my garage, HPS lighting 400 watt, and ventaliation fans. Rating: 5