How to thin something that is too thick

This is less a 'recipe' and more a list of ways to fix other recipes!

Things to add to savory dishes:

milk

water

sparkling wine

cream

Marmite, melted in hot water

chicken stock

onion stock

Things to add to sweet dishes:

sugar syrup

elderflower cordial

lemon juice

passionfruit syrup

cream

milk

apple juice