Looper.

Do you have an amp?

Various options, but the one I use most for convenience is actually a looper.

DL the backing track, convert to .wav, (my looper has no brainer conversion software available for PC) upload to looper, then off you go with all the portability and stop, overdub, loop, fade etc, convenience played back through your amp backing you on the guitar.

Most amps today come with a 3.5mm stereo input jack for phone connectivity and .mp3 playback simultaneously with instrument cable signal (guitar) jack input. Even the cheapies. You can also buy a version of this mini amp with BT connectivity if that's important to you.