Can OS-1 be diluted or mixed with other things? (E.g., soft drinks, water, or coffee?)
OS-1 should be consumed as-is. The composition of OS-1 is calibrated so that water and electrolytes can be rapidly absorbed. Diluting OS-1 or mixing it with other things disrupts the balance of electrolytes and carbohydrates and affects the speed of absorption. If you want to sweeten the flavor, a commercial sweetener that will not affect the composition should be used.