Don't think well make 80 miles
but I see where you're coming from.
I've not used the taps but I'd assume they were fine to use if they are marked on the route map from the site I linked.
The route passes at least one petrol station and runs through Wendover... I'm sure there will be a shop or similar.
I'll carry 2lts in my back pack and a 750ml bottle this will be plenty for me with one pit stop and I drink a fair amount.
The main thing is food really... I got caught out the last time I rode it by not eating enough... soon enough. At the end of the day it's not the wilds of Wales or the Highlands of Scotland... there's always a shop or pub nearby it just means that you spend time looking for a sandwich instead of riding