A heater is probably not necessary for most of them. They come mostly from American waters. An airstone or sponge filter would be good and you would probably get a few more to grow up.

Several times visited Ruth and Ed Warner's place. They are/were full killie breeders in the Midwest. I was struck with how they used those plastic dish washing containers, one buys and puts in their sink, for young fry. One couldn't see the fry from the sides, but overhead monitoring was easy. Uneaten food and dirt was a snap to spot. The dishpans (obviously bought in bulk and never used for anything but the fish) were easily bleached or at least scalded. When not in use, they made one nice handy pile, ready to go. (There have been long threads on the fish mailing lists over the virtues of sterite.)

I think you could make do with a one-gallon tank. I'm sure that space and expense issues come into play. Not wanting to mess with your affairs too much, but more little shrimp will survive if they have more shelter to get away from Momma - and you feed her well and get out ASAP after the eggs hatch.

How many grow up has a lot to do with how well you feed them, do partial water changes and - maybe - how much space you give them. If you already have the one-gallon, I'm sure, that in your shoes, I would go with that. If you are going to buy a new home for them and you have the space - and your parent's blessing for the project - you might consider a 5.5 or 10-gallon tank. They don't cost that much more than a one-gallon tank or even some bowls. They might give you more bang (and some more cannibalistic sibling shrimp) for your buck.

You might check those pages recommended by Google and see what "they" recommend for baby glass shrimp food. (I can see you - or me if this were my project - wiping algae off the side of other tanks and shaking the algae off of the paper towel in with the babies.) However I would bet a limited supply of crushed up flake food would do fine. Spirulina flakes, given their preference for algae, might be best.

Oddly, if you have a plant "gunky" with algae, that not so lovely plant might be a windfall for your shrimp. :) They are such opportunistic feeders, much like guppies, that they shouldn't be hard to feed and the plant should look better.

When they get some size, they would probably love frozen baby brine shrimp or those "decapped brine shrimp" after those have been hydrated. Do feed those in moderation though.