Where is the toilet?

On Day 5, from Aswan, we are supposed to board our felucca to spend the rest of the day on the Nile and a night under the stars before we get to Luxor on Day 6. The first thing that pops up in my mind is “where is the toilet?” The felucca is a sailboat that was once the only way of transportation in ancient Egypt on the Nile. Nowadays, it is still used for transporting, sometimes as a “floatel” for tourists seeking non-conventional travel. From looking at pictures on GAP website and the travel guide, it does not seem to have the capacity for a toilet onboard. Well, maybe we will take a hike to the bushes along the Nile? I drop down a mental note that I shall not drink too much fluid on Day 5.