quickly replace the stopper to prevent the foam from leaking out. the waterproof cover is sold separately. mix the blue food coloring into one bowl and the red food coloring into the other bowl. and as the name suggests the most important element and part that matters is the coolness. i must admit i haven’t even been in my garden at all this winter! it will be very helpful if someone here could explain me more about this topic. "so‚ from the first day‚ there was no doubt. 