וְאַתָּ֣ה קַח־לְךָ֗ מִכָּל־מַֽאֲכָל֙ אֲשֶׁ֣ר יֵֽאָכֵ֔ל וְאָסַפְתָּ֖ אֵלֶ֑יךָ וְהָיָ֥ה לְךָ֛ וְלָהֶ֖ם לְאָכְלָֽה׃
너는 먹을 모든 식물을 네게로 가져다가 저축하라 이것이 너와 그들의 식물이 되리라
Kli Yakar on Genesis
Take for yourself (or “from your own”). He was forbidden to take from others, even though everything was about to be destroyed. This would also increase the miracle since Noach surely did not possess enough to feed them all without a special blessing.
Sforno on Genesis
ואתה קח לך מכל מאכל, different menus for different species of creatures.
Radak on Genesis
ואתה קח לך, seeing that they will come to you in order to survive, you will have to prepare food for them, each species according to the type of diet it is used to. Even the predators will not be allowed to eat flesh while in the ark but would have to subsist on a vegetarian diet. They had, after all, been used to such a diet immediately after they had been created, as we have already explained on Genesis 1,25.