get a non-plastic bottle. plastic is notorious for harboring bacteria, and mold, because they are prone to microscope crevices from forming. probably a metal one. you might want to use soap and hot water for metal containers.

The solution to your problem is not to buy one specific bottle. The solution is to have two separate water bottles, so that you can swap and clean them on your own time.

Yeti wide mouth because it’s easy to clean. I just flush it with hot tap water and a drop of Dawn, let it sit for a few minutes, then hold my hand over the mouth and shake. Rinse thoroughly, then dry right side up so condensation doesn’t build up inside. The part to really pay attention to is the mouthpiece, but that is quickly cleaned with some soapy water and a rag.

Also, DON’T use your dishes rag/sponge on your water bottles, as it always has residual dish gunk (no matter how many times you rinse it) that will actually make your water bottle dirtier. Keep a separate rag for washing drinking bottles and wring it properly when you’re done.

The Contigo Cortland chill. I love this bottle so much if I lose it I buy another. I’ve been using this bottle for at least 6 years now.

Because it’s a button spout it’s very good for air sipping (water falling). Since I don’t put my mouth on it, there is less chance of bacteria developing in the bottle and lid.

The Lid folds open on the inside which makes it easy to clean by hand.

I see they have new filtered variants, I haven’t tried those yet.

Guaranteed to keep your water cool.

Anything that’s wet all the time is going to grow mold or algae or whatever.

Whether you rinse or scrub, if you just shake off the drips or even towel it off before you fill it up again it’s going to get gross.

It needs to spend a significant amount of time completely dry.

The solution is to have 2 bottles and switch them every few days.

Well I use a nalgene and a Kleen Kanteen. Both have that standard open mouth design. You’re gonna need to clean the caps and O-rings but they’re pretty good

this is less a problem with the bottle and more a problem with how you’re not cleaning them well enough.

Just learn how to clean them and clean them. There is no magic bottle that doesn’t.

I would just not care about the biofilm and wash it regularly. If you fill the bottle from a clean source and it doesnt smell or taste strange, the water should be fine for consumption.

You know your fresh water pipes also have biofilms in them? If it isnt contaminated, the microorganisms there are harmless. So if you get clean water from the pipes and your mouth has a healthy microbiome, where should potentially harmful microorganisms come from?

Only in rare amounts from the environment when you open the bottle. For that to create a buildup will take time. If you properly wash your bottle like once a week you should be fine.

No bottle will stay clean if you dont wash it from time to time.

The only thing that ever comes in contact with my water bottle is water. It is always spotless.

You are contaminating it with your mouth when you drink from it. If you put sugary stuff in there, you are basically carrying a petri around with you and asking why its growing stuff.

I have about 10 protein/gym shakers, that I use for shakes (obviously) but also just water. I have so many because they will sometimes come free when i order supplements - but they can be bought for a few dollars. I rotate them daily and just run them through the dish washer. Because they’re wide and the lid comes off they are super easy to wash and dry.

I’ll normally get a couple years out of them before they need replacing.

flip top stainless growler, get a bunch of extra gaskets and rotate them. I put them in the dishwasher in the cutlery tray that has a lid to keep things from flying out, then boil them submerged under a stainless trivet to get any smells out.

the bottles I just use soap and a brush and if it smells like anything after that then PBW or oxy powder.

bottles with straws, slide seals, the other type of flip lid, hollow lids, etc will inevitably have unwashable areas that will get nasty.

runner up is this. they fit the same opening

it looks like they dont sell the growler flip any more but I bought several for my klean kanteen knockoff (unintentional kkk) standard size bottles too.

Invest in a bottle brush and clean your container well.

32oz wide mouth Nalgene for me. I have 3 and cycle them every 2 days. Dishwasher when I run it and bottle brush once a week. Never a hint of anything.