Any neo species is fine. Any crystal shrimp will need at least RO mixed with tap at minimum for the grade you want. Invest in a little RO unit. They aren't much money. Water changes on even a 10g tank shouldn't be that bad. Just take a 1g juice container (washed obviously) down to a local grocery store or water mill. 1g of water is 10% in a 10g tank which is plenty one time a week