I did something similar. I got rid of my dial up connection and now siphon from my neighbors WiFi connections.
Now to be a good neighbor, I rotate each day so I don't use up too much of their bandwidth.
Likewise, for dinner I discovered that it is cheaper to just steal a sandwich from my local convenience and grocery stores. Of course I rotate between stores so that I don't put too much of a burden on any one store. Plus it provides me a nice variety so that I don't have to eat the same type of sandwich each day.
Now if only I can figure out a way to use my neighbors' cars. That way I can sell mine and save a lot of funds.
/sarcasm & jk
OP, there is a right way and a wrong way to limit your bills. Using your neighbor's WiFi, without their permission, is definitely not one. And as some have said, there could be consequences for your actions.