I am testing out making a tail OS through USB and then using electrum through it. This can be a cost effective and better solution rather than making a computer or a mobile an air-gapped device. With tail OS, the Electrum wallet comes by default and there is no need to install any more softwares. Secondly, you can keep save that USB like you save a hardware wallet.
Since i do not have any extra system with me right now to meet this emergency, is the tails USB with the built-in electrum can be trusted?
Better learn how to setup before doing it on your own or else you may end up either setting the wallet incorrectly or losing your bitcoins.
I would advise you to first watch these three tutorials to have a basic understanding. Although these are a bit old, but they will give you an idea of what you are going to do.