Yes its possible, if you are not travelling there for the first time. If you have been there for a couple of times then you probably know where to stay and how to reach Kedarnath.
Hill Station - Mussoorie
5-6 hours away
cheap accommodation bus fare - around 1500 (average)
train to Dehradun + bus - (Cheap)
CNG Vehicle - approx. 1000-1200 (Cheapest for 4 persons)