1)
Which morning was this?
1.
Malbim: If the water came in the morning, it was that same morning. According to the opinion that it came in the afternoon (refer to 3:20:1:1,2), it was the next morning.
2)
What is "mi'Neged"?
1.
Rashi: It is from far away.
3)
Why did the water look red?
1.
Rashi: This is normal, when the morning sun shines on it.
QUESTIONS ON RASHI
4)
Rashi writes that it is normal for water to look red when the morning sun shines on it. If so, why did they think that it is blood?
1.
Rashi: They never saw water in the valley (it is a dry Midbar).