I used to use Oat milk, but as a way of moving away from milky stuff entirely. Its not very milk-like in the same way as as soya milk, its also nicely simple – just oats and water, so it tastes different to milk but does a similar job. Works better in cereals than it does in hot drinks though.
I gave up milk and cheese about a year ago, and oat milk was a useful transition for things like hot drinks as I'd always had my tea and coffee quite milky. In the end though I felt that milky subsitutes are dodging the issue, particularly as they aren't as easy to lay your hands on, so I decided it was better to make a clean break. All that milk and (most) cheese really does is soften the taste of things and bulk them up, once your out of the habit of it you don't miss it. In fact I took a concerted swing towards small, sharp, strong tasting things and away from long, sloppy voluminous gloop. Swapped milky tea and gallon mugs of latte for thimbles of espresso, swapped lager for whisky etc. It took quite a while longer to get into longer black coffees and black tea. With tea it was actually an adjustment in how long it takes me to drink it, I'll nurse a cuppa for quite a while.
Given that milk and cheese where pretty much my favorite things, now on the odd occasions that I fall off the lorry (float) I wonder why I ever bothered with it in the first place.
Breakfast… espresso, orange juice, toast, marmite
If I've got a bit more time on my hands then Jamie Oliver's Eggy/chilli/crumpets with bacon. Brilliant, sounds a bit whacky but its not. The only down side being chopping chilli at 6am – you will will will rub your eyes.