If you want to evaluate what option works best for your setup, let me know:
To protect your data and device, use for browser-based portability, or download LibreOffice Portable if you need a free offline suite on a USB drive. microsoft office 365 download center portable
Microsoft provides dedicated, official mobile apps for iOS (iPhone/iPad) and Android devices. These are not "portable" in the USB-drive sense, but they are free to download from the Apple App Store or Google Play Store and allow you to work on the go. If you want to evaluate what option works
A traditional portable app runs entirely from a USB flash drive or a isolated folder without installing files into the Windows registry. use for browser-based portability