Taking the tone of your question literally, and not arguing the philosophy behind it, do your shopping at Walmart online for inexpensive camping gear to stuff into the bucket panniers. Strap a foam sleeping pad to the rack top. It's all there. Skip the sleeping bag. For those temps, a flannel sheet or fleece blanket will suffice. Take a running suit along to wear at night if it gets a little chilly. Use a small stuff sack for clothing. It can double as a pillow.

Should touring turn out to be a serious hobby, your experience with the cheap gear will help you decide how you want to upgrade.