Seforno: If the people avoid being attracted to their enemies' gods, then they will all be able to serve Hashem without fear of anyone talking them out of doing so.

Ramban, Targum Onkelos and Targum Yonasan: It refers to worshipping Hashem (bringing Korbanos).

Ba'al ha'Turim: It refers to Tefilah. ¹

Bava Kama, 92b: It refers to Keri'as Sh'ma and Tefilah.

Ba'al ha'Turim: Because on the one hand, Hashem never rejects the Tefilos ¹ of the Tzibur, whilst, on the other, He proceeds to bless each member of the community according to his individual needs.

K'li Yakar: Bearing in mind that 'All of Yisrael are responsible for one another', it is only when a large number of people are serving Hashem in unison ² that He blesses each individual according to his needs.

Ramban: Most idolaters understand that Hashem is G-d over all deities, only they believe that worshipping His servants will bring them success. ¹ Therefore the Torah writes that it is through worshipping Hashem exclusively that one attains success and protection, and that destroying the idols, far from causing harm, brings only goodness and blessing ² in its wake. ³

Ba'al ha'Turim: Refer to 23:25:3:1,

K'li Yakar: Refer to 23:25:3:2.

Ramban: It means that there will be an abundance of food and beverages.

Seforno: It means that the bread that one eats will satiate and not cause illnesses. ¹

Lev Eliyahu (p.196): It is also a B'rachah for Torah. ²

Refer to 23:25:6:3**.

B'rachos, 48b: It is only called 'your bread' before you eat it - and, reading "u'Varech" as if it was written "u'Verach' ('recite a B'rachah!') the Pausk is obligating a B'rachah before eating bread. ¹

Eruvin, 65s: Just as 'your bread' can be bought with Ma'aser Sheini money, so too, 'your water', which must therefore be referring to wine. ¹ And what the Pasuk therefore implies is, unless the wine flows like water, ² it is not considered a B'rachah.

Oznayim la'Torah: Until now, Yisrael were guests at Hashem's Table - they ate bread from the sky and drank water from a roving well. Once they entered Eretz Cana'an however,, they would eat their own bread - that they baked, and drink their own water - that they themselves dug. That too, however, would come with a Divine blessing, provided they listened to Hashem's word.

Ramban: It means that one's food and drink will be healthy and will even cure existing illnesses, let alone not causing new ones.

Rashbam: It means that Hashem will heal the illnesses that are caused by bad water. ¹

Bava Kama, 92b #1: The Torah is referring here to the eighty-three ² illnesses ³ that are connected with the gall. ⁴

Bava Kama, 92b #2: Commenting on what Chazal said 'Arise early and eat in the summer before the sun (becomes hot) and in the winter, before the cold (sets in)' and on the mantra 'Sixty runners can chase after the man who ate breakfast but cannot catch up with him!' - 'Va'avadtem es Hashem Elokeichem" - 'This refers to Keri'as Sh'ma and Tefilah'; ⁵ "u'Beirach es Lachm'cha ve'es Meimecha", following which 'Vahasirosi Machlah mi'Kirbecha!" ⁶