Free Can of HOP WTR (After Rebate)! Snag any HOP WTR flavor from any store, and they will pay you pack for the full amount. Check here for the store locator. This is a great way to try a new product. All you have to do is buy HOP WTR in-store. Snap a picture of your paper receipt and text it to them. Get cash back in 24 hours! They will send you a venmo rebate for your offer.