Feeding for the child with cerebral palsy - Source

If he cannot manage to hold a glass,
give him a mug with a large handle.
This will be easier for him to grasp.
You can help him to hook his fingers
through the handle of a cup and hold
it.
If your child still finds it a problem to
hold a glass and drink, teach him to use
a straw. Drinking with straw can be
taught to a child who is able to understand
your instructions. A child who can
drink from a glass can also be taught to
use a straw. It will be an additional skill
for them.