I pretty much try to keep my regular flavors in their own tank -- blueberry muffin/banana nut bread in my cartotank, Virginia in one of my kayfuns -- though that may be changing, as I really don't care for or vape that Virginia much at all anymore. My other Kayfun, I switch flavors in it a lot, and it can be a real pain -- the stainless holds no odor, but the o-rings do for sure, and maybe also the plastic part of the tank. So far I've managed, but eventually I may run into a flavor so strong that I have to boil that kayfun to get rid of the odor.
The thing about cartos is a definite +1 -- I have the punched cartos for my tank, but I also keep some regular cartos around, if there's a flavor I sorta like but want to "try on" for a while. I do have a dripper I can use for quick taste tests, but I hate dripping for just sitting around, so the plain cartos are a good compromise.
I'm finding that it's true that using multiple flavors helps to prevent "taste fatigue", a/k/a vaper's tongue, so it really is a good idea to have several tanks setup with flavors you like to rotate around -- also because certain flavors go together (my tea with blueberry muffin), and certain flavors emphatically do NOT (pineapple juice with blueberry muffin, argh -- or drinking tea with a coffee vape -- that one is just WEIRD).
Andria
Boy! The more I read, the more that I didn't know that I didn't know! I feel so stupid

Is Kayfun a tank? If so, is it a type of tank or a brand?
Are 'catros" tanks like an EVOD?
What is a "dripper"?
So, if I'm going to use dedicated tanks (eventually because I can't get them all at once)
Should I stick with glass or is plastic okay? Although, I'm not sure I like the idea of all plastic all the time.
My husband has a cherry that I find is nasty! Too sweet and chemically tasting. I want to start making my own. Don't worry, I'll ask my questions about flavors over there, or just like the helpful posts
We all start out going, umm... are you speaking English, or what?