Road Trip

Hello pretty ladies!!! I need some advice from everyone! Next weekend my husband and I will be taking a trip to San Diego. We live in Santa Clarita so it’s going to be a 3 or more hour drive. The issue is we will be traveling with our 3 month old!! I’m freaking out!!! Does anyone have any tips and advice? I am open to all suggestions!! I want to start packing the babies stuff so that I don’t forget anything for him. I rather forget my stuff than forget his stuff. Also, should I buy a manual breast pump so I can pump on the road or what do you guys suggest I do for breastfeeding?