If I were you, I wouldn't take a whole egg mass; just take a piece of one, or a smallish mass if you can find it. You would need a lot of room to raise the 50 larvae from a typical mass. But 10 or so larvae can be raised in a 10 gallon aquarium.

Are you willing to raise live food? Cladocerans (e.g. Daphnia) work well and are easy to raise.

I would also strongly warn against returning the larvae to the pond. This is illegal in most places, and for good reason; captive animals can pick up diseases and transmit them to their wild cousins if released. If you are not willing to provide for these animals all their lives, don't take them. If there is a pond nearby, consider visiting it regularly over the course of the next few months to capture and photograph the larvae as they grow.

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