At this point of time, make sure the roads are not blocked. You should hire a cab or bike from rishikesh or you can opt for the govt bus from rishikesh upto chopta.
In Chopta, there was only one temporary stay at that time. We got information of that from Duggalbitta itself from the locals. Regarding Ukimath, you can get any of the cheap homestays for ₹100 per night. There are very small places and hence not listed on any platforms. That is the key point of making a budget trip.