What to do when visiting someone’s house while potty training?

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My daughter just started potty training a week ago. Today she is FINALLY comfortable with her training toilet. She used to shake and scream on it, but she finally isn’t scared anymore and actually asks to use it. On Father’s Day, we will be going to my dad’s house for about 5 hrs or so (it’s 45 min away). What would you do in this situation? Would you bring the training toilet with you? I’m a first time mom so I have no experience with this. I KNOW 100% she is NOT going to use the big toilet. My husband mentioned putting a pull-up on her while she’s there, but we have already transitioned to underwear (aside from naps/bedtime) so I don’t want to confuse her or set her back. How would you handle this? Thanks :-)