Tails already come with Electrum. But if you want to do it yourself, Tails also come with Tor included and you can do whatever you want online, even adding Sparrow or Bitcoin-Safe to the stack.

The idea is to use Tails as a total independent OS, wherever you are, offline or online and you are able to make how many copies you like to that USB as a safety precaution. That doesn't mean you should have all your stash there and use only that usb. Remember my other guide to think like a bank and compartmentalize your stash in 3 main parts with multiple wallets.

Consider this scenario of using a USB with Tails as your "escape plan" in case of SHTF.

In this way you can have all the time a OS dedicated only to your Bitcoin use and keep the rest of your PC/laptops / OS out of this.

Don't be so paranoic for your 0.11BTC stash