Looking to grow cherry red shrimp. Maybe experiment with brine, but tried it before, didnt have good results.
Red cherry shrimp are super easy. Put clean dechlorinated water in a 4+ gallon tank on the windowsill, let it sit for a week or two until it turns greenish, toss in the shrimp, and top off monthly. I've had all kinds of shrimp breed in that setup. Some basic plants will help too - hornwort, or java moss, etc. And you can add some snails as well. Their waste will help in producing the green water/algae which the shrimp will feed on.
A variation on this is to use a tank with a nice strong light in the right spectrum to grow green algae and then follow the same process. It might take 3-4 weeks instead of 1-2 weeks because you're not getting direct sunlight.
A filter (sponge) is optional but not required unless you want to increase the number of shrimp. Ditto on water changes. I've had up to 15 adults breeding in a 6g bookshelf tank with probably 40 offspring at any given time for months now and I hardly ever touch the tank. Finally, you don't' need a heater either. Keep the temp around 60+ (and under 80) and you should be good.
Final note - this does not apply to all shrimp, only most Neocaridinia variants like red cherry, fire red, etc. Yellow shrimp have been more sensitive for me and others; crystal red shrimp and some of the more expensive kinds also need special care e.g. low PH and regular small water changes.
