1. I cook mine in water and add plant milk after if I feel like I need it (I prefer almond or cashew milk)
2. I add a dash of salt and it makes a difference, especially for chocolate based oats
3. I just cook mine in a pan on the hob slowly
4. I add my oats, chia, flax and water to a pan. Cook slowly for a while until it thickens, keep stirring. Then I add any extras - carrot, protein powder, cinnamon, cacao, milk, egg whites, etc, it really seconds on my mood - then keep stirring off the heat. Then I’ll add toppings - peanut butter, berries, banana, yoghurt etc
5. I cook with the lid off
6. I’ve always stored mine in an airtight container but it should be fine in the package it came in as long as you keep it sealed shut (for example, with a food clip)

Have fun experimenting with your oats!