We use the tommee tippee weighted straw cup. We have a little stick with a tiny brush on the end (may have come with the bottle, not sure) that we can use to clean the inside. It's tedious but does the job and avoids any mould! X
One Green Bottle 350ml. Our whole family have these in different sizes, the only issue is the lid can break if thrown around (which the little ones do!) but you can buy replacements
Pura Kiki bottles are the best - I’ve only ever needed one - they are stainless steel and amazing! Leak proof too
Munchkin tip and sip weighted straw bottle. Easy to clean and comes with a special pipe cleaning tool for the straw x
Ion8 leak proof kids water bottle