From LSAC website about what you're permitted to have with you: "Beverage in plastic container or juice box (maximum size: 20 oz/591 ml). Aluminum cans are not permitted."

When you get the 405 error, keep refreshing the page and eventually it will let you in!

SAME

Definitely seek accommodations. The test goes by pretty quickly, so I think the average person wouldn't need a bathroom break if you go beforehand, but you might as well seek an accommodation to have peace of mind.

The proctor will put your computer on Do Not Disturb if you haven't already!