YOU SAID:

one time I went to the store and there was no milk

INTO JAPANESE

一度店に行って牛乳がなかった

BACK INTO ENGLISH

I went to the store once and there was no milk

INTO JAPANESE

私は一度店に行きましたが、牛乳はありませんでした

BACK INTO ENGLISH

I went to the store once but there was no milk

INTO JAPANESE

私は一度店に行きましたが、ミルクはありませんでした

BACK INTO ENGLISH

I went to the store once but there was no milk