All you need to know is that 32 is 1/3 of 96 so you need to put in 3 times as much water as Virosan. Therefore, since 1+3=4, you need a number divisible by 4 to work with. you can either go with 5 oz of Virosan and fill it up to 20 oz with water, or use a measuring cup to get 6 oz of Virosan and 18 oz of water for 24 total oz.