Lush
Mods' Pet
As others have said, Alzheimer's Society are great for advice.
Also, re dehydration, you may find these useful....
www.jellydrops.com
Also, re dehydration, you may find these useful....

Jelly Drops: Sweets To Support Hydration | Official Website
Jelly Drops are award-winning sweets to boost hydration. Invented for people with dementia & now enjoyed by anyone wanting to increase water intake.
