Burger king (Canadian) rather than Mc Donalds, Branston rather than Heinz,
It's the tech stuff that's harder, Google will be the last to go, but I've started - I'm using DuckDuck go and Firefox.
I've stopped using Amazon - difficult but not impossible - 1 month in and have found lots of alternative suppliers. i have found a way of emailing books bought elsewhere to my kindle.
And to all those who say, well we can't do x because y, well perhaps not, but Trump and his cronies only understand money, and if boycotts hit them in their pockets, they may just pause. Look at Tesla!
If we do nothing, they won't change.
We must not let the perfect be the enemy of the good.