Place the red jello into a medium bowl. Place 2 cups of water into a pot and bring to boil.
Pour the boiling water over the top of the jello and stir well until the jello is dissolved. Repeat with the green jello.
Pour the red jello onto a large cookie sheet or a baking pan, and the green jello onto another cookie sheet or baking pan.
Place the baking pans or sheets into your refrigerator. Let the jello chill and set for about 3 to 4 hours.
When the jello is set, make the milk mixture. Place ½ cup of cold water in a small bowl.
Bring 1 ½ cups water to a boil. Pour it over the top of the unflavored gelatine mixture and stir well.
Pour 1 can sweetened condensed milk into the mixture. Stir well to combine, then place it in the fridge for about 10 minutes to let cool down.
Grease a bundt pan or 9×3 pan with cooking spray.
Cut the jello into small pieces. Place all the jello pieces in the pan.
When your creamy gelatine mixture has cooled down, pour it over the top of the jello pieces.
Place the pan back in the fridge for about 4 to 6hours or overnight.