I have one of those babies from years and years of computer work, long hours in the saddle. Long fasting can definitely be hard on the exit hatch, and it pops out.
I just pop it back in. No problemo.
Also, I have done several long fasts, and when the lemonade no longer does me I like to switch to fresh juices, which never fail to make me feel like I am drinking jet fuel!!! I continue.... til I'm done and feel like a million bucks. Always an option.