Can I use apt or snap on Bazzite?

For apt, use Distrobox with an Ubuntu or Debian container. You can install packages with apt inside that container without trying to turn the Bazzite host into an apt-based system.

That works well for many command-line tools and some desktop applications, though it doesn't make every package part of the host system. Software that needs deep access to host services or hardware may need a different approach.

Bazzite does have package managers, just not the usual apt setup. For desktop apps, check Bazaar or Flatpak first. Homebrew is another option, especially for command-line software.

There's also rpm-ostree for adding packages to the host. That's generally better saved for things you actually need on the host, since it changes the system deployment rather than just installing an isolated app.

Snap is less straightforward here. A container might be able to run it with extra configuration, but I wouldn't assume a snap package will work just because apt works in Distrobox.

Check whether the software has a Flatpak or a regular package you can use in a container first. If you have a particular app in mind, its requirements will make a big difference.

If you want to install and tinker with host packages constantly, a conventional distribution may be a better fit. Fedora is one option, or Debian if having apt on the host is the main goal. That's a tradeoff against the setup you already like in Bazzite, though.