Looks like a fairly short walk. We stayed at CS last week; there were signs posted at each bus stop: For Blizzard beach and Typhoon Lagoon, take a bus to Disney Springs and then transfer to a bus for the water park. There were no direct buses to the waterparks.
Take into consideration what month you'll be visiting; in summertime heat I wouldn't even attempt it. The heat was beyond Sweltering last week.