DS (4 years) not drinking enough?

[rubyslippers]

DS is a fab eater ... Always has been

However, i am slightly concerned about his lack of fluids

He has barely drunk anything today ... A cup of water, a slurp of juice with lunch and then nothing

He refused a cup of water at breakfast time

I offer him milk and water with each meal and he has a sports beaker he can help himself to whenever he wants

He often says he is hungry but i think he is confusing it with thirst

Have tried jazzy cups and straws ,,, not sure what else to do

TIA for any tips or advice

Bump ...

I know its not thrilling ...

DS1 used to be like that when he was 2-4. He's now 6 and can be persuaded to drink. The helping-himself-to-water part didn't seem to work. I made sure he has a drink every meal, and at snack time. But it wasn't easy ...

Oh thank you .... Maybe nagging perseverance is key

Bribery? If he drinks a cup of water/juice/whatever then he can have some chocolate/biscuit/sweet?

DS (3) is like this. He lives on fruit and veg, has milk on cereal in the mornings and will often have a drink of water before going to sleep.

I figure if he was thirsty he'd drink.

If I'm bothered by it I give him a tiny splash of apple or orange juice well diluted with water. He thinks this is a big treat

Write the numbers 1-6 on piece of paper stuck on the fridge, everytime he drinks a cup of water/juice/milk he sticks a sticker over the number. 6 (small) stickers equals a reward.

Thanks for the advice and tips

I like the sticker idea very much