No fish is best for a bowl, buy at-least a one gallon tank with filter, and you will clean it once every 2 to 4 weeks, a bowl will have to be cleaned every week. Also, your fish can swim better with more room, become less bored, and will be happier. If this is above your budget, fish is not for you.
Betta
I would say gallons. Depends what kind of fish, but smaller than 10 gallons seems cruel.
The best candidates are Betta fish and Paradise Gouramis
To maintain a healthy environment for fish in a fish bowl with water, it is important to regularly clean the bowl and change the water, provide proper filtration and aeration, monitor water temperature and quality, and feed the fish appropriately. Additionally, avoid overfeeding and overcrowding the fish bowl to ensure a healthy environment for the fish.
None, else, have 10 Foot shark :-)
Goldfish
A fish in a bowl
Gallon.Gallon.Gallon.Gallon.
depends on what kind of fish
If you want a fish bowl fish I recommend a betta fish but, none do.
A fish bowl is not a solution its what you keep your goldfish/ beta fish in :P
Well usually every 3-4 days is best