Good lord, that's an ambitious trip! Good on ya, man.
Since you have the 10-22, I'm assuming a crop body. I'd pack for 3 lenses but I'm going to depart a bit from the norm and I know I might be crossing your budget up a bit, but there are reasons:
10-22, obviously, for your landscape/nightscape/wide angle needs.
Tamron 18-270 or newer Sigma 18-200 for your all-around shooting needs. Not going to be top of the line lenses, but TOTL lenses will weigh a ton; both should give you good enough images, are compact and light and aren't totally bank breaking if something untoward occurs.
Canon 400 f/5.6. Relatively compact and light, for your wildlife needs. On that route you ARE going to see mammals, birds and reptiles that you will want better record of than the 200mm-ish options are going to make possible
I'd also consider one of the MeFoto travel model tripods, like the Globetrotter. These should collapse small enough to either pack or strap to your frame without adding TOO much weight and you're going to have sunrise/sunset/etc shots that just won't capture as well without one.
EDIT: Saw further comment that you're thinking portraiture; Another possible loadout would be:
(still strongly urge) 400 f/5.6