We use a Nuby one. I can’t remember what it is called, but this is what it looks like.
It has a removable handle for when baby gets bigger and doesn’t need it.
It comes apart, so it is easy to clean properly.
And it has a teat just like the bottles for baby’s milk, which was great for our son as he couldn’t get the hang of other sippy cups.

Nuby works well for my child. Easy for to use and easy clean

I enjoy browsing at Target /Big W/Kmart etc. It is best to use a tight lid so that when it is shook , the lid wont come off . Basically a plastic cup that has a secure lid and perhaps a spout for easy sipping. Lots of brands to choose from now .

yes first years as well. pretty cheap and my kids had no issues with them. tommee tippee is great too.

We loved using “The First Years sipper cups, easy to use, great for getting your toddler to hold the bottle with 2 hands, spill proof etc.