You can’t stand with the water protectors if you’re living in Malawi or Montenegro, but you can support them.
1) You can support protectors directly with money or supplies. They have a pretty comprehensive website, with lists of what they need and an Amazon wishlist.
2) Unicorn Riot is an independent journalistic organization committed to getting frontline footage of protests – covering things the mainstream media finds uninteresting or unprofitable. They’re at the Standing Rock protest.