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Late as hell to this, but I've carbonated scallop before in an iSi, and the effects are unique, but fleeting (you feel it more in your fingertips when you're holding it, than when you're eating it). Here's the dish: https://www.instagram.com/p/0eUaYupXeF
Alcohol would probably make a good solvent but then you need to find a way to get the alcohol out without losing your compound, otherwise you just have boozy peppers. If you're going to use alcohol, I'd use something fairly potent and as flavorless as possible like a strong grain alcohol. Still, the easiest would be to just buy the extract, there also looks to be a product called Zanthalene for cosmetics. They use supercritical CO2 extraction which can deliver very specific aroma extracts but requires supercritical CO2 and a system to handle it, which you can't just buy on the internet.
Well, it's watermelon. There are a lot of advantages to using a vacuum sealer. A lot of which deal with the longevity of freshness of the product, consistent cooking time, and in this case a complete change in texture.
If you look at a watermelon; it's fibers are so spread out. Vacuum sealing the watermelon compresses it making it a more solid, more condensed product. If you were to add another liquid, such as sesame oil to the bag before vacuum, that liquid would also be forced into the product. In other words; You're watermelon is compressed into a smaller steak line product in the end.
As for your second question. The one you've linked is fine at getting rid of most of the air out of the bag, and will help preserve your food. If that's all you want to do, then that one should be fine. There are two types though, and the one that you most commonly find in professional kitchens are chamber vacuums. There's just a more wide range of things you can do with them, compared to a regular vacuum sealer.
At work we have a large chamber vac; which was pretty expensive (3-4k) But the same manufactures make smaller ones that aren't as expensive. Here's one... I have one just like it at home. It was probably one of the best investments I've made.