And some additionals I have noted:

Heat

Jesse (near water) and ridges (wind) are cool, tall grass is a pain - no wind, humidity, sun from above - just sucks you out - drink a lot and orderly, don't wait for trackers to stop - they are like camels they don't drink and rest. Once I got pretty close to check it - stop to sweat, feel cold and feel sick in stomach...my winter EU organism wasn't up to a dehidration paste change at first - did OK later.

Grass

Seeds are nasty - they get everywhere - gaiters are a MUST even with long trousers - one of the trackers forgot them once and was out of order the next day. Polo T-shirts are worst - they attract seeds like comb and leave no space between them and skin. Don't take a fleece - you will look like porcupine. Soft shell or windbreaker of sort are great for a morning drives.

River crossings

I advise to take gaiters, boots and socks off before crossing - pay attention where you come out of the water - don't go on fine sand - you won't be able to take it all off - it will stay on your feet and cause blisters no matter how good your footgear is worn in. Best is finding a rock or grass or even mud.

Bug repelent

It is of little use once you go through morning grass full of dew - it will last 5 minutes. Don't worry tse-tse won't follow you in tall grass but will jump you when you are back on the road or near vehicle and there are almost no mosquitos.