Betas can and will do "ok" in a small bowl. In my experience they are much "happier" when placed in a larger tank. Small bowls are convenient and can make a nice desk accent, but they require a lot of maintenance. Like, daily or every few days. When you've got that little water and especially with no filtration, decaying food and detritus will change the water chemistry a lot faster and more drastically than a larger habitat with filtration. Also, if he is just putting in tap water, he might do better to let it sit overnight before changing it out, or (preferrably) invest in some water treatment chemical. Pretty much any municipal water source has enough chlorine and other chemicals in it to not be overly healthy for whatever aquarium fish might be swimming around in it.
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