This is for a container and lid to utilize the readily available automatic drinker cups you can purchase on amazon, temu, wish etc. I Purchased the cups on temu and amazon and designed the container to work with the cups. 

In my model pics, you can see the infill due to thin walls. It was my tester and works well but just for the sake of cosmetic appeal, I made a print profile with more walls and infill to make it more visually appealing but it worked great as printed with 2 walls and 8% gyroid.