Kroger has a digital coupon for $0.20 off sparkling ice. This can be combined with an Ibotta offer for $0.50 back on Sparkling Ice Tea (must be tea, not the regular flavors). Since it is on sale for 10/$10 this brings the total to $0.30 for one. Enjoy!
P.S. If you redeem this Ibotta offer on two separate occasions you earn a $1.00 bonus, making this deal technically free.