וַיַּשְׁכֵּ֣ם אַבְרָהָ֣ם ׀ בַּבֹּ֡קֶר וַיִּֽקַּֽח־לֶחֶם֩ וְחֵ֨מַת מַ֜יִם וַיִּתֵּ֣ן אֶל־הָ֠גָר שָׂ֧ם עַל־שִׁכְמָ֛הּ וְאֶת־הַיֶּ֖לֶד וַֽיְשַׁלְּחֶ֑הָ וַתֵּ֣לֶךְ וַתֵּ֔תַע בְּמִדְבַּ֖ר בְּאֵ֥ר שָֽׁבַע׃
And Abraham arose up early in the morning, and took bread and a bottle of water, and gave it unto Hagar, putting it on her shoulder, and the child, and sent her away; and she departed, and strayed in the wilderness of Beer-sheba.
Rashi on Genesis
לחם וחמת מים BREAD AND A BOTTLE OF WATER — but not silver and gold, because he hated him for taking to degenerate ways (Exodus Rabbah 1:1).
Ramban on Genesis
AND THE CHILD, AND HE SENT HER AWAY. This is to be understood in connection with the above: And he gave to Hagar [the bread and bottle of water]… and the child, for he gave her the child also to go with her wherever she will go.
Rashbam on Genesis
ותתע במדבר באר שבע, that is why she ran out of water, a supply of which she had carried with her. Avraham had given her a big enough supply if she would have taken the direct route to Beer Sheva.