Hey Sarah,
I can't give you a link, but I made a brine shrimp hatchery a little while ago. I used a tall cylindrical food-safe container with a bubblestone in the bottom. I just added a spoonfull or however much it said to add on the packet of aquarium salt and a spoonfull of brineshrimp eggs (teaspoon that is).
They hatched within a couple of days, depending on the temperature and I had 3 containers going at the same time so that there was always enough brineshrimp there for the little axolotls.
Hope that helps.
Cheers,
Steffi