There is really no highway that accesses Aguas Calientes from Cusco, so taking a bus for the entire journey will not be a possibility. The trains are your best wager! (which stops in Ollantaytambo along how). This direct educate route is provided by both of those PeruRail and IncaRail and https://jaidenswxxx.blogsvila.com/26791133/fascination-about-machu-picchu-tours