I would recommend a commercial ice maker that produces nuggets over cubes. Cubes are more likely to melt and turn into water while nuggets will stay solid for much longer - especially if you're using them in drinks or with food. If your unit makes crushed ice, then it's best to use this type of ice as opposed to cubed because crushing the pieces breaks down their structure and allows the melted liquid inside each cube so they will be less icy than big chunks of hard frozen water crystals.