We generally let the clients purchase their own laser. Some people use the Colloidal Silver. If you do that you should reimprint the drops every week because there is a stability issue with non-alcohol imprints with exception to the laser.
Homeopathics with 20% alcohol are safe for kids. We generally put 2-3 oz of hot water in a cup and put the # of drops they have to take in the cup and let sit for 5 minutes and the alcohol evaporates. Another option is to use Natural Solutions blanks. They only have 8% alcohol. You can also use the laser.