I also don't like sweet flavors. The best I've been able to find are teas (though you need to watch that, since some are massively sweetened - I got a mint black tea that tasted like mint jelly) and tobaccos.
Other possibilities are citrus fruits and pineapple, though you need to use a glass topper with some of those since polycarbonate has a bad reaction to some flavors. Other fruit flavors that aren't as sweet are black currant and cranberry. I do DIY now for liquids and have been fairly happy with a tart cranapple I'm working on. Some spice flavors aren't as sweet either. I'm working with cardamom right now as a single flavor and in combinations.
Other possibilities are citrus fruits and pineapple, though you need to use a glass topper with some of those since polycarbonate has a bad reaction to some flavors. Other fruit flavors that aren't as sweet are black currant and cranberry. I do DIY now for liquids and have been fairly happy with a tart cranapple I'm working on. Some spice flavors aren't as sweet either. I'm working with cardamom right now as a single flavor and in combinations.
