Nobody knows for sure, but check out casperz's results, they were achieved using just cet in tap water.
I'm using just demineralised water, which is ok but I do have issues with evaporation. I've mentioned here before that if you want to use just water, consider a higher concentration so you don't need to apply as much liquid.
I'm using just demineralised water, which is ok but I do have issues with evaporation. I've mentioned here before that if you want to use just water, consider a higher concentration so you don't need to apply as much liquid.
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