YOU SAID:

I am going to the store to get some milk and eggs for dinner

INTO JAPANESE

夕食に牛乳と卵を買いに店に行く

BACK INTO ENGLISH

go to the store to buy milk and eggs for dinner

INTO JAPANESE

夕食用の牛乳と卵を買いに店に行く

BACK INTO ENGLISH

go to the store to buy milk and eggs for dinner