1)
Why are they hungry and thirsty?
1.
Radak: One does not find water or any food in the Midbar. People take provisions in advance for the required number of days. When they get lost, and cannot find the road, the journey is extended.
2)
Why is their Nefesh wrapped in hunger and thirst?
1.
Radak: They have no way to be saved from it, only to scream to Hashem. Malbim - their food and the water in their Kelim was finished.
