Do I need to toivel used glass jars (mayo, coffee, etc) before using them for food products? For example, using a used mayo jar to store soup?
According to R’ Moshe Feinstein zt”l you don’t have to tovel it, since it was considered subservient to the food it contained, and now that you decided to reuse it, you are the one making it a kli therefore it doesn’t need tevila. Most other poskim however say that now that it is being reused, it is considered a kli and it needs tevila, according to some with a bracha and according to others without. The best thing would be to tovel it without a bracha, many however rely on R’ Moshe.
Don’t need Tevila- Igros Moshe O:CH 1-122(9), Y:D 2-40,
Tevila without bracha- Tzitz Eliezer 8-26, Machazeh Eliyahu 100-12,13, Ohel Yackov Ftnt.144 in the name of Avnei Yoshpe, Pischei Halacha pg. 154 in the name of Be’er Moshe,
Tevila with bracha- Mbais Halevi Yoreh Deah 146-11, Chut Shani Shabbos 1 pg. 219, Shemiras Shabbos Khilchos 9-12 in the name of R’ S. Z. Auerbach zt”l, Teshuvos V’hanhagos 1-446, Mishne Halachos 4-107,