There is definitely no road that accesses Aguas Calientes from Cusco, so having a bus for the entire journey will not be an option. The trains are your best wager! (which stops in Ollantaytambo alongside the best way). This immediate educate route is provided by the two PeruRail and IncaRail https://damienqsttt.blogunteer.com/26319510/top-machu-picchu-hiking-tours-from-cusco-secrets