In a couple of months, my wife and I will be on a 40 day road trip, doing a 'lap' of North America through the US and Canada. I'm planning on shooting about 40 rolls, and want to develop it as I go along. Having 40 rolls to do when I get back is bad enough, but then I have to fly back to France, which makes it worse. Besides, there's something adventurous about souping film in a motel bathroom. I generally use D-76, but I'd need to make up and carry 10 litres, which I don't want to do. It will be HP5+, mostly at 200, a little bit at 800. What's a good all round concentrate liquid developer for a situation like this?