The next day we left from Shillong and reached Guwahati. We had flights back to our place the next day in the morning, so had to stay at GUwahati for one more day (you can look for return options the same day ). We explored local Guwahati, famous Kamakhya Temple and left for our place the next day.
The cost breakup is:
Rented vehicle: ~ ₹ 8 k (try to reduce this one)
Stay : ~ ₹ 1.3 k (almost ₹ 300/day)
Food: ~ ₹ 1 k
This could be entirely possible that you do this trip in a different or cheaper way. However this was my experience and I am proud of myself for not caring about "हाथ का मैल aka पैसा".
Don't be completely reckless though!
One thing I know for sure is, "I may or may not have money later, but I will never have the same time!"
You cannot explore all the places of North East even in 15 days. But, the ones we visited were perfect (excuse driver choices).
Also, a humble request to carry one bottle and minimize the use of waste and any kind of plastic.
If you are short of time just explore one part, either Tawang valley or Meghalaya. If you have read properly you will notice enough gaps to explore more or reduce number of days.
Another great option in North East is ziro Valley which is my next year's bucket list.
I hope you find this blog useful if you do follow @woman who wanders
If you have any doubt or suggestions please tell in the comments or dm.