There is actually no street that accesses Aguas Calientes from Cusco, so using a bus for the entire journey will not be a choice. The trains are your best bet! (which stops in Ollantaytambo along the way in which). This immediate teach route is offered by both PeruRail and IncaRail https://machu-picchu-hiking-tours05936.blog2news.com/27254523/the-greatest-guide-to-machu-picchu-tours