Will it really keep it from getting soft/melting? Did you just layer it on the bottom or on the top as well?
I'm going to a memorial day barbeque/agilty games picnic and it is supposed to be hot! Combine that with running around with dogs in the sun and I'm thinking that ice cream cups and fruity popsicles would be very welcome. I'm just not sure if dry ice will really keep it frozen for hours on a very hot day. Ever tried this?