There are forest routes to Kadalivanam from domalapenta. But the route doesn't had any indications. Only experienced person who know the route can travel in this route. Three years back one batch tried travel in this route without proper knowledge and missed in the forest. After a rescue operation by State government with Helicopters they reached srisailam. So It is not advisable to travel in this route.
Other option is going to Srisailam. Take a boat from there, go to akka maha devi caves, get down in opposite bank of akka mahadevi caves, there take help from one local chenchu and he will guide the route to kadali vanam. It is better to go there in this route also in Karthika masam, In that time large number of pilgrims will go there.'
Dont go laone or without guidance. Remember it is a tiger reserve forest.
Have a safe journey and got blessings from Lord Mallikarjuna swamy.