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Would I need to cycle a vase aquarium for a betta? It would probably hold about 2 gallons of water.

No, it's not necessary to cycle a tank for Bettas.... but you do have to use a treatment to rid the water of chlorine... YEARS ago (and I'm speaking of a LOT of YEARS!) I kept several bettas in small individual bowls - never once cycling (because frankly, I didn't even know about cycling! ) - and all did well.... even bred one of the males and one of the females in a 10 gal tank with success!
However, this time around (in fish keeping I mean) I've changed a lot of my "old ways".... I now use already cycled water from my 55 gal tank to "start" a betta tank; use regular aquariums with heater, filter, etc.; and would never dream of placing a betta in ANYTHING under 2 gallons! I decided that this would be best for the betta's quality of life - both physically and environmentally.... and in turn I've reaped personal benefits as well - seeing healthy, happy fish!
Partial water changes are essential - as bettas prefer fresh water.....
Hope you find a Betta Beauty! ENJOY, ENJOY, ENJOY!

To thine own self be true...

Just treat the water, and do 100% water changes at least once a week. I have 11 tanks that I clean per week. I try to do it maybe every 5-7 days myself.

Would I have to cycle for a 10g?

If you plan on doing a 100% water change every week, then no. However, if you want to use a filter and only do partial water changes, then yes.

If you are going to have just the one Betta in a 10 gallon, then there is no need to worry about cycling. Just do partial(about 10%) water changes every week. Even without a filter, the tank will cycle enough to support one Betta.