This tells me that you'd be in a lot of trouble if you lost your phone or had to wipe it because someone got into it. It's probably good then that you're now thinking about this so you can prepare for a time when you won't have your phone for other reasons.

All sites supporting 2FA usually allow you to use a second method. Email is usually an alternative. Assuming that your email is your universal second OTP method, you just need to make sure you will always have access to your email account and you'll be fine. So just solve for the OTP problem for your email account.

Pre-buy your burner phone and make it a second OTP device for your email account. For more assurance, buy a couple of physical keys (like Yubikey) that can be used with your email account. These can also be set up for some of your other accounts that support it, which may be more convenient than email when accessing them.

Assuming your 2FA method is TOTP. Back up the 2FA keys to an encrypted file, with a long passphrase. Take it with you (or store it in the cloud, in this situation this is possibly safer). The when you need them just

• install a TOTP app
• import decrypted keys
• login to things. Then when you’re done logout of things and delete the TOTP app.

Thanks for the suggestions. Here is what I’m probably gonna do:

• Upgrade BitWarden to premium
• move my TOTP codes into there
• Get a Yubikey for 2FA for it
• Keep a second 2FA TOTP option available in case I lose the key

Then all I’ll need to do is reinstall it, and log in with the master password and key and be good for any of my sites.

How many services do you need to log into during the trip? If it's a minimal set, you could temporarily change their passwords to something memorable, and then change it back using your password manager when you return.

I carry a yubi key to unlock my password manager. (Probably shouldn't have said that) If you have a form of 2fa they wouldn't know about, that might help you

So your password manager uses your phone as 2FA, and the credentials inside your password manager also use your phone as 2FA? Hmmm...

So essentially, you can't bring your phone, that's the main issue. Does your authenticator on your phone support exporting a backup? Then store that in your password manager if that's possible and set up an alternative 2FA for your password manager (SMS on the burner phone number perhaps or a security key). Then when you arrive, reinstall the authenticator on your burner phone and import the backup.

Post the phone to yourself?

could you store them through physical means? if so, consider what passwords you'll likely need (if you can't write all/most of them) and put them in a notebook? not qualified to speak on this at all btw just spitballing