Sorry Orange riders but it's the only bottle I had that fitted a 50mm washer and a Britta filter.
As long at the moving stream water come from high up above sheep and I use these
http://www.cotswoldoutdoor.com/index.cfm/product/lifesystems-chlorine-dioxide-tablets/fuseaction/products.detail/code/B5210007
I guess/hope I'll be fine for a day or two without the need to boil the water.
What do the collective think?


