Put a water quality detector in the water bottle to detect if the water is dirty or not, if the water is not clean, it will let you know and also make it clean.

Don't use the matieral that is plastic, use the coating, so the hot water can afford in.

Put a water temperature controller inside the water bottle, it will tell you what is the water temperature and it will also controll it.

Still use a stainless steel water-bottle but add some soft glue material inside, so when it falls down, it will not be too loud.

Don't use the paint to color the water bottle, use another material to color, and also make the stainless steel of the water bottle stronger, so it will not make a hole.

you can make a filter in the straw to make the dirty water clean. It will be like life straw . A life straw is used at the wild, when you don't have clean water to drink, you can drink dirty river water using a life straw.

we can use the soft plastic. I have a soft plastic box, it is used as put food. It can also fold, when you don't want to use it, yoou can make it smaller.

we can add the thing that can know teperature. So when you drrink water, you don't need to be afraid of the water temperature.

we can use the soft plastic to make water bottle. The soft plastic is soft and when it fall down, it will be very quiet.

we can make water bottle like hot water bag. It is like fabric, so it won't have holes.

Add one more layer inside the plastic bottle, the layer is like thermos bottle

Put a machine in the water bottle, it will change the water to the temperature you want in the definite time, so you will always know what is the temperature inside it.