For those with this pot to face, try holding the back of the rounded part of a spoon against where the water first reaches to act as a guide. It should neatly follow the curve down to the tip of the spoon. Alternatively something like a chopstick will also serve the purpose. The flip lid looks to make this more complicated to manage, but some practice with cold water first might edge out a workable plan. Maybe run the handle of the spoon under the lid right at the hinge and a thumb on the lid to pinch it into place.
I've used this to put oil into a car without a funnel - just leaving the lip of the oil bottle in contact with the readily available dip stick for a no-spill re-fill. Also used in chemistry class to introduce a liquid into another liquid without spilling or splashing.