Book a hostel in Manali and take the bus. If interested in trekking visit jogni falls. There's a lot to do in and around Manali. If you need details dm @curly_saga_ on Instagram.
Try to reduce your cost on stay and transportation which are the two main expenditures in travel. For stay, you can either opt to stay for free with Couch surfing app or you spend less by staying in any of the hostels. You can try hitch hiking or contacting a local friend, if any for reducing transportation costs.
Public transport, hostels/dorms and street food is the key. I have explained this in details on a post in Tripoto named Travel tip for students who do not earn yet!
Its depends on budget and where you from travelling try local transports unreserved trains coach,help from cars and bus ,local homestay or hostels,try local street food,take some essential items like tea,coffee,salt,sugar,maggie ,waterbottel which will reduce your cost and you can travel with budget
Try the following:
1. avoid peak season
2. stay in hostel
3. public transport
4. local food
5. travel light
6. explore by walk to maximum
7. talk to locals for good and cheap options
8. bargain hard