If traveling economy, consider pay-per-use Frankfurt lounges in Terminal 2; they provide essentials like snacks, drinks

https://www.scribd.com/document/1053551868/Frankfurt-Airport-Lounge-Benefits-Why-It-s-Worth-the-Upgrade-152445

If traveling economy, consider pay-per-use Frankfurt lounges in Terminal 2; they provide essentials like snacks, drinks, Wi-Fi, and showers.