Nothing or nobody says anything has to be put in water to clone something. Hell when I was a kid we use to take cuttings of house plants and stick them in a coffee cup on the window sill with just tap water in it to get roots. Cloning gels, powders and solutions are not required but have been proven to AID cuttings in producing roots. Superthrive is Basically a vitamin booster that aids in stress relief and making uptake of basics easier for the plant. If you want to try and cut down on the time it takes to get roots from your clones and also possibly increase in success rate then use the additives. If you just want to use that ol coffee cup you can do that to. there is no set in concrete way to clone just a bunch of different roads that end up going to the same place.