Toilet. The green bag stored on the left has to be installed in it before use; both seat and bag can be installed in every seat in the troop compartment, and there's also a small partial curtain with the set in case you don't want to have your comrades watch you while doing it:
Water heater, complete with tap - actually they just used the same unit the British put in the Challenger:
The notion for the toilet is that in certain deployments you do not want to stop the vehicle to have the soldiers do their business on the roadside due to them having a good chance of ending up dead from mines, IEDs, small arms fire assaults.
The water boiler is necessary because the new generation of German MREs needs hot water to become edible. The Brits use it for tea.