1)
Why was he spilled like water?
1.
Radak: It was amidst fear of them. It is a metaphor, as if he melted.
2.
Malbim: My strength is too weak to stand against them.
2)
Why does it say that his bones came apart?
1.
Rashi: They are harder than water. They did not melt, but they became disconnected. This is like "Nifzeru Atzameinu l'Fi She'ol" (141:7).
2.
Malbim: The bones (e.g. knees) knock (Daniel 5:6).
3)
What is "ka'Donag"?
1.
Rashi: It is wax that melts due to the fire's heat.
2.
Malbim: The heart, which is the root of the entire body, because like wax, that melted into the innards.
4)
What is "Me'ai"?
1.
Radak: All internal limbs are called Me'ayim.