Hi April!
As a mom of three, I can definitely relate! Although my daughter is now 3, it feels like just yesterday that I was asking myself the same question! The bottle liners are a great idea as you can easily dispose of them. My biggest challenge was the actual formula itself. My middle child was accustomed to the "ready to feed" so that had to be refrigerated. I soon discovered that you are allowed to bring small coolers to the Disney Parks, so I would pack the formula in a small collapsible cooler (using a plastic bag full of ice from the hotel) in the basket of the stroller. When I needed to heat the formula, I would visit the Baby Care Center to warm it up. My daughter was a little different. She liked the powdered formula, so all I needed to bring was enough powdered formula to last me the whole day. I would buy the single serve packs of formula because they take up less space and I would buy room temperature water in the parks to make her bottles. Again if I needed to warm her bottle, I would go to the Baby Care Center or if we were dining at one of the restaurants, I would ask the waiter for a cup of hot water and I would stick the bottle of formula in for a few minutes. I would strongly recommend that you familiarize yourself with the
Baby Care Center page and stop by when you visit the parks. What I love about it is that they sell diapers, formula, over the counter medicines (which really helped me during one trip when my baby had a fever) and other baby supplies. Just keep in mind that they may not have all the brands of formula or diapers, so you should still plan on bringing your preferred brands.
Hope this helps! If I can assist you with any other question, please feel free to send them my way!
Thank you for submitting your question to the Disney Parks Moms Panel!
Yael