Re: antibiotics + 2-3 nights away = supply dip
Antibiotics typically do not have a negative impact on supply. Being sick is much more likely to cause a problem- you can get dehydrated, your body puts more energy into surviving and fighting the illness and less into milk, if you're really sick you might not nurse or pump the way you need to.
I think a pump is always a good idea when there's a separation of >24 hours. With a toddler, I think that maintaining supply is less of a priority than avoiding engorgement or plugged ducts. But I wouldn't want you to run out and buy a cheap pump, only to discover that it doesn't do the job. Do you have an electric pump that you could take with you?
Coolest thing my big girl said recently: "How can you tell the world is moving when you are standing on it?"
Coolest thing my little girl sang recently: "I love dat one-two pupples!"