As it was Eid next day (5 June 2019), an official holiday, I took off for two more days (6 and 7 June 2019) and bought me some time for a trip to Tosh-Kutla -Tosh glacier.
There are two ways to reach Tosh:
1. Delhi - Manikaran - Barshaini - Tosh.
Delhi to Manikaran , only two buses are listed on HRTC’s(Himachal road transport corporation) website. So it might be difficult to get the bookings. In that case second route needs to be taken.
2. Delhi- Bhuntar - Manikaran - Barshaini- Tosh :
While booking tickets, you won’t see Bhuntar as a destination from Delhi, so you book a bus with destination as Manali. Bhuntar lies on the route from Delhi to Manali. From Bhuntar you can easily get a bus for Barshaini/Manikaran. From Manikaran both bus and taxis are available, but buses have their own timings so you can book a taxi in sharing with fellow travellers. From Barshaini you will get taxis only for Tosh. Again , you can book a taxi in sharing.
I booked a bus from Delhi to Manali on 4 June 2019 at 7.30 pm, using HRTC’s website. The bus left from ISBT Kashmere Gate at exact time (but experienced the typical Delhi traffic).