No, you can't put a algae water in with your Betta. For one thing, you shouldn't have 2 fish in only a gal. of water. It won't solve your problem much, the more fish, the more waste and then the more you have to do water changes. Also Betta's are good living in a vase, but not most algea eaters. Then of course there's the problem of the Betta tring to kill the algea eater.

I don't where you keep your Betta, but if he's near a light, move him away, less light, less algae. Also, not to be rude here, But once a mouth for a water change is a little long and not real healthy for him.

Why do you have to take him home, you can't do a water change at work? It make his and your life a lot easier, I would think, if you could. Oh,well none of my Biz, I guess.