I also agree with Artindark and Halo. Usually my visions are dreams, but sometimes I may have one during the day(I call them Lucid Dream Visions), and you can't just pick and choose when it happens. You simply learn to live with it. Meditation does help with handling it and still functioning in your life while you have the visions, but it won't make them stop. Scrying and meditation may help you to have a vision, but this leaves the possibility of your subconscious just making something up because you're forcing it, and it may not be true. If you do try scrying, I would avoid water scrying, because the water tends to be wishy-washy about the visions it gives, its more likely to be influenced by your own desires and not the actual future/present/past.
My humble opinion and experience.