Place 2 graham crackers in a plastic bag and crush with rolling pin. Pour the crushed graham crackers on to a plate. Dip a towel in water and moisten the rim of an empty glass. Place the rim of the glass in the middle of the crushed graham crackers and twist until entire rim is covered. Then, fill the glass with 4 oz of water. Drop in 2 Alka-Seltzer® Original tablets and let them dissolve. Once the tablets are done fizzing add the amount of ice desired and complete your mocktail by garnishing the rim with a mini cinnamon-sugar donut. Enjoy!