Storage of password

There are some security controls related to the protection and storage of passwords:

9.3.1 Use of secret authentication information: Regarding to your question, here is important to ensure proper protection of passwords when passwords are used as secret authentication information in automated log-on procedures and are stored.
9.4.3 Password management system: Regarding to your question, here is important to store and transmit passwords in protected form.

What is my recommendation? Use a software as a password management system, and store your password there. Also can be interesting that another people of your organization (closer to you) have access to this software.
Anyway, please remember what is the list of mandatory documents reading this article “List of mandatory documents required by ISO 27001 (2013 revision)” : https://advisera.com/27001academy/knowledgebase/list-of-mandatory-documents-required-by-iso-27001-2013-revision/

Save the password in a safe and let responsible people for this information are recommended?
Or let part of the password in one place and another part elsewhere is advisable?
Or do you only recommend the use of software?

For me the best option is the software, because is more easy and confortable to manage the ISMS. Anyway, others options can be good for the ISO 27001, the standard not says how you need to manage passwords in a specific way