Watermelon Hard Seltzer Brewing KitThis Hard Seltzer Brewing Kit has everything you need to easily and quickly brew a gallon of hard seltzer at home. Get the best Hard Seltzer Brewing Kit with the finest ingredients and equipment. Your homemade bubbly seltzer finishes at a refreshing 4. 5% ABV in just 4 weeks. Make hard seltzer in 3 fruity flavors: Watermelon, Lemon Lime & Grapefruit. Made in United States of America Thank you for supporting American made. Goods Made Here.