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...
For the inexperienced, goldfish. They are inexpensive, hardy (low maintenance) and grow rather rapidly. Warning: goldfish are territorial and are picky about what kinds of fish (and other creatures)...