DIY Foam Soap Refill - 3 tablespoons liquid hand soap or 3 tablespoons Joy dishwashing soap 2/3 cup warm water Directions: 1 Gently mix soap with water. 2 Do not shake. 3 Pour into foam soap dispenser. 4 Note: I used Dawn dishwashing liquid (apple blossom anti-bacterial soap) with great results. 5 I did a test run first using 1 tablespoon soap to 4 tablespoons water.