label a large (gallon) sized freezer bag with name, date and instructions - in this case 'add 300ml's of water'
Add all the ingredients to the bag except the water. Give it a good squish about to mix everything
Flatten and squeeze out as much air as you can and seal the bag
freeze until needed
Defrost overnight
Dump the contents of the bag into the slow cooker and pour over the water
cook on low for 8-10 hours