The first thing to say is that Kiwengwa is a little off the beaten track, and one must be prepared to rough it a little bit. Accordingly, don't expect each day to be just like the last for example in terms of precisely when things happen. That said, even by the extraordinarily friendly standards of the area, the staff at Breeze (known locally as 'Breezy') were wonderful, wonderful, wonderful. I had friends staying at a nearby resort on an all-inclusive deal, and they coveted the insider knowledge I had simply as a result of staying at Breeze: You can get Kilimanjaro beer (20,000 shillings for three litres) and some spirits at the bottle shop, and pretty much everything else at the minimart (the local primary school will appreciate donations of stationery, by the way).
By all means, pay the supplement for breakfast, it's enough food (coffee, fruit, chapati, egg) to see you through to dinnertime—and for dinner delivery I'd recommend Si Burgers over Waikiki in terms of price, quality and speed of service. Also note you'll be showering in brine, which added to all the sun might mean you'll need some kind of moisturising lotion.
