when i get them, they are already moist - prolly distilled water. i spray the hell out of rockwool with liquid karma though, which is a nutrient - here ill grab the bottle and list its ingredients. it can be used for veg/flower/foliar feeding/cuttings.
total nitrogen .1%
available phosphate .1%
soluble potash .5%
humic acid .01%
aloe vera extract .01%
yucca extract .01%
its mainly good for the humic acid i think, its organic like all my nutes; this one comes from fermented yeast extract and kelp seaweed extract. its about 19.99 at the plant store. you can use a variety of other nutrients to use for cuttings, i would recommend this one because i have 30 clones w/ 100% success rate. you can also get CloneX, but this stuff works just as good + you can use it as a nutrient.