1)
Who will be shamed?
1.
Rashi: Those who [planned to] drink from them. Everyone was sure that he will drink from them.
2.
Ibn Ezra: The caravans. They are thirsty, and come to where they hoped for water. So my brothers betrayed me!
3.
Malbim: People who relied on the water, and did not prepare water to drink.
2)
Why does it say "Ba'u Adeha"?
1.
Ibn Ezra: They came Ad (until) the place. The feminine is Adeha.
3)
What is the difference between Bushah and Chafirah?
1.
Devar Eliyahu: Bushah is shame in front of others; Chafirah is shame that one feels himself. If one sent a Shali'ach to find water, and trusted in him, there is Bushah. When they themselves come to there, there is Chafirah.
