I have a child with adhd and epilepsy every holiday , he has capsules to take this was a lot of hassle. He only could take them with yoghurt, never water, he opened them all sorts of rubbish. Basically with water was impossible, he could not swallow.
The problem was he did it wrong and nobody in that children's home had learned him to do it right! Age 10! The trick when taking a capsule is taking a zip of water and put the capsule in the mouth, than putting you chin on your chest and swallow (the capsule float on the water, if you put the head back it's very tricky to swallow as the capsule stays in front of the mouth). After I made him do this he was fine taking the capsules with water.
Maybe this is usefull info for other parents who's children have trouble swallowing capsules.