1)
Why does it say "Efer ka'Lechem Achalti"?
1.
Radak: This is a metaphor. His bread in his mouth is like ashes to him - "va'Yagres be'Chatzatz Shinai Hichpishani ba'Efer" (Eichah 3:16).
2.
Malbim: I ate ashes in place of bread, due to hunger.
2)
What are "Shikuvai"?
1.
Radak: They are all kinds of drinks, e.g. wine, milk and water. Everything that I drink is mixed with the water (tears) of my eyes, like wine mixed with water.
3)
What is the meaning of "bi'Vchi Masachti"?
1.
Rashi: I mixed [my drinks] with tears. Radak - this is like "Maschah Yeinah" (Mishlei 9:2).
2.
Malbim: I constantly cry over the Churban, and this angers [my enemies], and they reviled me for this.
