Create a ToDo List and then share it. Just send the link!
Write a title and create the ToDo List.
You will be able to add, check, unckeck and delete items.
Save the url to come back to the list, is the only way.
You can share the list in two ways just sharing the url or the link:
3. Work together
Lists are ready to be changed simultaneously by two or more users.
Anybody who has the url or the link can access the list. More info