There are two main transport options from Manali to Kaza for solo travelers:
1. Bus: There are daily buses from Manali to Kaza that are operated by the Himachal Pradesh Road Transport Corporation (HRTC). The journey takes about 10-12 hours.
2. Taxi: You can also hire a taxi from Manali to Kaza. This is a more expensive option, but it is also more convenient, as you can travel at your own pace and stop to see the sights along the way.
If you are on a budget, I recommend taking the bus. The buses are comfortable and reliable, and the ticket price is very reasonable. However, if you are looking for a more convenient and flexible option, you can hire a taxi.