On CD-70, Maximum Cost of the Trip
Fuel; 5K/Bike
Hotels; 3K/Day (You can save this by Camping, if you are brave enough to camp)
Food; 1500/Day for two of you.
Jeep Fares; Depends, where to go. (Can't go everywhere on bike especially for lakes)
Entrance Tickets ; Shangrilla Resort 500/Person and so on, depends what are you visiting.
Emergency/Backup/Extras; Should be round about 5K for both of you.
Now Calculate and Travel with fun, best of luck.