First off, you want a substrate that buffers the pH down around 6.5 or below.
Second, the RO water or distilled as recommended. If you have soft water, then a cheap RO machine can work, although the replacement cartridges may be the same amount as a new machine. If you have hard water, then I would recommend a more expensive RO unit.
Third, you'll need GH minerals for shrimp. (no KH)
Make sure you have a liquid test kit that measures all water parameters, including GH and KH. A TDS meter with calibration solution is also recommended.
Sponge filters with an air pump can be used for filtration. It's recommended to get the type that suction to the side of the aquarium.