Where can i buy litmus paper or ph tester in berryville virginia or winchester?

Go to Lowes or Home Depot and look in the water purification and hot tub sections. Some Toys-R-Us have them in the chemistry sets. Call pool/hot tub, aquarium, gardening, and water purification stores in your area. They usually stock them for water testing. Most Radio Shacks and Ace Hardware stores carry pH testers.