Hi there... you don't have to think about it so much ..just take a bus to sonprayag and then to Gaurikund . Rest you have to travel by foot 👣. Don't worry about the food there are lots of langar stalls on the way. carry something to eat while you start the yatra as the trek is tough and after some distance you won't find anything to eat. And most importantly pack your stuff according to the weather there. it can rain anytime there and it's chilly and windy. So keep your warm clothes handy and just say HAR HAR MAHADEV...🕉️🕉️ keep your morale high it will test you to the limits.