You can actually clone in just a cup of standing water. Ive never done it with Cannabis but others have.
Cloning in a cup of water by onthed10008
Felt like I needed to expand on this subject considering other growers have begun to do this purely on my rants and raves on exactly how simple this method actually is!
First U cut the plant in the desired location.I prefer the Tops of the plants themselves(Topping).If U cut the stem be sure to leave at least one node for future growth on the stem.(Future Cloning) Or future (Bud sites)
Second Be sure to cut @ a 45 degree angle with a SHARP clean knife, shears or razor. I used a pearing knife for awhile.
Third Be sure to have a cup of water handy to place the cutting in directly upon cutting. Its Best to cut in water so air does not enter the main cutting stalk.
Fourth Scraping. This is done quickly. U want to scrape at least the bottom 1/2 inch "SKIN" off the bottom of of the main stalk of ur cutting.
THIS means removing only the OUTSIDE layer of green "SKIN".GENTLY. Just be carefull.
Fifth U can place these cuttings directly in the cup of water. Although ive been experimenting with dipping them in rooting hormone and superthrive ive had awesome results in just placing them in plain water.TAP WATER.
Sixth Cloning medium. This consists of the cup and the water. I cut my cups.( I use regular red plastic party cups found everywhere !)I cut the cups to size to be sufficient enuff to brace the tops of the cuttings (SIZE of cuttings).Meaning, the upper fan leaves dwell on the top of the cut cup.
Seventh This is the last step. WATER LEVEL IN CUP. I put enuff water in my cup to completely cover the area which I scraped. Usaully 1/2 inch to a quarter. THIS water is CHANGED AND WATCHED daily.
Reason being. Cutting drink lots of water sometimes so stay on top keep ur water level consistent. Changing ur water only enstills U are taking every action neccesary to be sure ur water will not stagnate on ur new babies.
Its that simple hope this clears up things for a few people. Its very simple.
Source:
https://www.rollitup.org/newbie-central/140167-cloning-cup-water.html