you can make it for about a week maybe two, maybe three, but that is deffinately pushing it. Your roots, leaves, stem, the whole damn plant man, needs a certain amount of nutes the whole point of oxygenating the water is to help deliver the nutes to the roots non stop continues and this is what makes DWC perferable because your plant can better acces the nutes. this naturally turns them into nute monsters. It's worth it though. As soon as I see leaves I start adding the nutes my DWC plants are 2 weeks old and at 700 ppm right now and are loving it. But remember Oxygen helps deliver nutes to the roots so with out any nutes you are defeating the purpose.