Do you keep a potty chair in the car or bring something like that with you in early potty training days? (Especially if you have a girl, I imagine it's easier for boys). Wondering if we need to get a potty chair for our 2.75 yo and if so, if we should get something more portable. We have seat reducers for the toilets and she sits in them fine but doesn't actually pee or poop in the toilet yet.