When I was growing up my folks and their adult friends told me that watermellon is best by itself but if the melon is rather tasteless, as sometimes happens, then a light sprinkle of salt will bring out flavor and sweetness. I thought it sounded crazy but tried it with a particularly flat tasting melon and it actually substantially improved the taste. Weird. I wouldn't salt a good melon but if the one you have is just so-so a small sprinkle of salt really works (unless you have another good tasting melon).
Now, as to vodka, OK but light rum works very well also. I prefer my vodka as a very dry martini with an anchovy olive.
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