I'm back now, back in the UK
So, as an update to my own question.
Mozzy Net. For sure, take one. I only used it twice, but I tell you I was really thankful that I had it with me on both of those nights.
Water Purifier. I didn't really go off the beaten track so bottled water was always available. I should have used it, but I didn't.
Pacsafe. Glad I left that baby at home, never ever missed it.
For anyone else heading out that way, make sure you go to Ethiopia, really great country.
Cheers,
Ron.