Instant power spaced out

After reading around 50 posts related to instant kava, spacing out your shells and best way to consume it probably left me more confused.

FVK instant on the bag says 1 tablespoon in 400ml of water. Should I drink that all at once or after mixing my glass only drink 100m about every 10-15 minutes apart? This is my first time drinking kava so I know there is a chance I may not feel anything but any suggestions are appreciated