I put my daughter on the toilet before leaving and if she didn't go, we stopped at the Target or Jewel bathroom (or where ever we happened to be) first thing. I told her that I had to go, whether or not I did, and we'd both try. We did that for a couple weeks until I was confident that she could make it dry. I also bought a 2nd cheap little potty for the car "just in case" we had to stop to go right away. I put plastic bags in the catch basin so there was never anything to clean, just a bag to throw away. And one more thing...with a girl, I found it was really easy to wear dresses for awhile. If she had a little accident, it was almost always while standing or walking en route to the toilet. All I needed was new underwear, socks, and a 2nd pair of shoes in the very worst case instead of pants or a full new outfit. Another little magical trick we used - a small pantiliner! It's great to catch a dribble or two while you're out. Although, it can sound a bit odd to others when your tiny kid announces, "Mommy, I just peed a little on my pantiliner!" in public like my daughter did!!!