I couldn’t for the sake of god put this on a water bottle which by the way I saw the reviews and saw a lot of reviews who did it with a water bottle but I couldn’t figure it out. One day sis picked it up decided to try and worked. Maybe I was doing it wrong but personally it wasn’t an easy installI was very iffy about getting this but man this lil green guy is the best. I'm getting 4 more. All the sippy cups don't compare to this guy.It's easy to clean, easy to put on after you figure out the right side to use cause it fits 2 different size bottles wider threads and the smaller threads. Leak proof is amazing I've been using for about a month and he hasnt chewed the tip off. Still not leaking. Suction power he squishes the soda bottles until they are flat.My boys love drinking out of my water bottle and now they can use there own and they are so happy with it love it great productThis is a great tool to keep handy. We are on the go constantly and it never fails that we forget or lose a sippy cup. This thing has saved us so many times!The best for on the go! My little one love it and it keeps him for asking for my water bottle every 10 minutes! 10/10 I recommend this every momma!My 1 year old loves it! So convenient and love the cover that comes with it. It’s so nice that there are two thread options for different bottles. I use it on Great Value and mini Kirkland bottles.It works great for my toddler but the only problem is it's really hard to get water from the spout and since there is no air hole it collapses the bottle in on itself which then makes it impossible to get any water out you have to constantly open the top to let air in the bottle so they can drink more pain then it's worth.Genius idea! My 9 month old granddaughter loves being able to drink from a regular water bottle by herself. Many of my friends and family have purchased since they have seen the tip on use.I didn't realize this at first but You can turn the green part of the cap upside down and it will fit 2 different sized bottles. One is small and the other fits normal sized water bottles. This worked perfect for my daughter and I was happy buying it. Only downside is no air gets into the water bottle so when she is done drinking the bottle has crumpled up into a small little bottle haha.No es de mala calidad pero solo le queda a un tamaño de botella en especifico. Para cuando el niño puede sostener esa botella en realidad ya no necesita este adaptador. Producto poco funcionalI previously gave this 1 star because I couldn't fit the product on any waterbottles here in Vancouver, BC. BUT.. if I take it apart and flip the green piece it DOES FIT. It does have the suction issue others have posted about, but with a little work my daughter and I can now share waterbottles and it saves me some weight in the diaper bag.Perfecto para darle de tomar a un menor que aún no sabe usar bien botellas o vasos. Su boquilla con dos medidas lo hace ajustable a cualquier tipo de botella. Excelente opción para cuando estás fuera de casa.works wonderfully. Only complaint is that it needed a small hole in order for my granddaughter to actually get any water out of it. Other than that works perfectly and doesn't leak when thrown or dropped.