Not drinking water

My toddler is going to be 3 in May and recently he’s been spitting water either on the floor or into a container and barley drinking it. I’ve tried multiple different cups, tried it with straws, he’ll even do it with milk. He likes the honest juice boxes and will drink those, but I don’t want to give him those constantly, but I also don’t want him to get dehydrated. Any tips on what to do?