Should I water? First lithops

Hi everyone! I bought this (already etiolated) lithops back in September. I haven’t watered it yet because I thought it looked like it was starting to split when I bought it. Today I noticed the wrinkling starting on the sides, so should I water or continue to let it be? I also haven’t repotted it or anything, so please let me know if this setup needs changed at all. Is there anything I can/should do about the etiolation? Thank you!!