Offline Suggestion (No Idea Where to Put This)

A tool to practice League offline would be nice. I live with four other people who use the internet frequently and I have garbage internet since I live out here in the middle of nowhere. Because of this, my connection isn't good enough to play League during the day. Being a "night owl" kind of person, I'm completely fine with going to bed at 7 am just to play a good amount of League. During my off time during the day time I usually either spend it studying champions, strategies, builds, or whatever. It'd still be nice to have an offline mode for times when I want to try out something during the day or times when I might not be connected to the internet.