Either of these routes could work (and there are other viable options as well). Personally, I would recommend manufacturing and selling on a very small scale first. If you can achieve a market footprint and sustainable demand (however small), then you have a lot more leverage to justify something like licensing fees.
Have you tried selling them? Do you plan on doing so? It's crucial for any new entrepreneurial venture to demonstrate conclusively that people will actually pay for their product. To be blunt, I wouldn't pursue this any further until you have sold the 500 units that you already have.
According to your website, your product needs electricity too ("Place your ICBlocks in the freezer for a couple of hours.") If I need a freezer for this product, why not just use my freezer to keep my beverages cold or create ice for my ice bucket / cooler box?
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