I've kept them a few times, and I'm going to see if my dried sand has any eggs when the weather warms up.
I keep mine in a long glass dish with tall sides (it originally held floating candles). I put sand and fine gravel in the bottom, and use Crystaline bottled water for them to live in.
I still have a packet of triops food that came with a set, but I have been told that they can eat granular fish food and bits of grated carrot.
I get quite aggravated with their short life span, but they are hugely amusing when they are alive