Can I cut fruit up and freeze it to put in the dc's lunch? Anything special I need to know? Will it thaw too fast or slow if I just put frozen chunks in their lunch? When I freeze, how do I keep the chunks from sticking together? I have a large watermelon ice cube in my freezer right now. I will probably make snow cones out of that but I can't send it to school with them. Any other ideas? TIA