4 1/4 cups water
4 large limes, cut into wedges and seeded
1/2 (14 ounce) can sweetened condensed milk
5 tablespoons white sugar
Combine water and limes in a blender; blend until smooth. Strain mixture through a strainer into a bowl; discard solids. Pour lime mixture into blender. Add condensed milk, ice, and sugar; blend until combined.