From the list shared on your device, you can click the … option and save as template. The template double page icon will show on the top toolbar so you can click it and create a new list from the template. The new list will show up as not shared. If you save your grocery list as template it will keep your items and let you create a new list with those items. When creating the template you have the option to include completed items so those will be kept in the template and added as incomplete in a new list. If you want the lists on your other devices, it should sync if you have cloud enabled for reminders and signed in with your Apple ID.
Sorry for your loss.