Here are some handy tips to get you started:
NO cow’s milk (unless ‘lactose-free’), rather try eg. rice milk.
Avoid deep fried foods.
Avoid very sweet drinks – These can worsen diarrhoea. Sipping on fluids regularly is essential – water, diluted sports drinks eg. Gatorade, rehydration solutions and more.
A little buttermilk or yoghurt may be tolerated. Cheese may be a good choice for some and dreadful for others.
Smooth peanut butter (used sparing) is ok (UNLESS ALLERGIC or previously not tried in a child) eg. On rice cakes or white toast.
Boiled Potatoes (no skin) are a good choice for many with diarrhoea.
Ripe Bananas can also help.
Try incorporate some soft protein foods at most meals.

