Dilute each pack of jello in separate containers with 1 cup of hot water each. Stirring for 5 minutes until jello is dissolved
Place containers in the refrigerator for the jello to set. (at least 3 hours)
When it is almost time for the jello to be ready, in a small bowl add 1/4 cup cold water. Add gelatin to water and leave to bloom for 5 minutes (Gelatin will turn to sticky consistency)
Boil a little more than 1 1/2 cups water
Combine condensed milk, with 1 1/2 cups boiled water and bloomed gelatin and set aside to cool
Remove jello from fridge and cut into small pieces
Lightly spray a dish (at least 9 *13 in size)
Add cubes of jello to dish and gently mix them up
Add condensed milk mixture and place into fridge to set again (at least 2 hours)