Ask HN: How do you share passwords?

How do you deal with the fact that some passwords have to be shared?

From less vital services like Netflix to rather important ones like the water and power companies' sites, I find myself having no choice but to share passwords with my wife.

I've gone from wanting to use a simple shared Google Sheets spreadsheet, to considering writing a password storage solution myself (egads), to thinking a password manager would be best. However, I'm somewhat unsure if that's really the best way and don't know which one(s) to trust the most.

What would HN suggest?

(We're both macOS and iOS users, if relevant.)