As far as I am concerned (and I realise I am probably alone in this!) oats and milk just do not belong together.
For hot porridge I make it with water in the microwave, no need for soaking overnight.
In the summer, I soak the oats overnight in just enough water to dampen them, then add a chopped apple, maybe a sliced banana, and some yogurt in the morning.
And never the sachets. Far too expensive. I get Scotts Old Fashioned oats.