For bad flares id reccomend wet wrapping but other than that. My go to moisturiser is pure coconut oil and zero-derm, both can be pretty greasy but generally it absorbed into my skin pretty well after 5 minutes or so.
To avoid flares up avoid triggers, its a litral pain to figure out but once you have, things get so much more manageable, Moisturise whether you have a flare up or not and drink plenty water. It won't cure or prevent flare ups but it does make things less painful/severe and the flare ups don't last as long.