In the past I have seen having a Google drive document and have FTP username/passwords there.

Is storing passwords in Google drive a good practice? 

Is Google Drive safe?

I wouldn't say that Google drive is not a safe place to store sensitive information. But I bet you cannot rely on it. When it comes to 
protecting your sensitive data/privacy, it is always good to be sure, and just trusting drive is not being "sure".

Solution:

One word, Encryption.

Encrypt your data before you store them in the Google drive. Now you don't have to depend on Google to protect your data security, it is you who should keep 
your mouth shut about your key ;)  

Note:

Encryption is not always needed when storing normal data which falls under the general category(something like the things you share in the social networks,etc.)

But it is really a great option when it comes to storing your confidential information in drive and in my experience, I am pretty sure that passwords fall under this category.
