I know it's not physically possible to drink from 2 buckets at once.
What I mean is, can you combine the water from two buckets together into a single bucket and get a pig to drink from that bucket (so the pig is effectively drinking from 2 buckets at once)?
(After drinking from this bucket, if the pig died within 15 mins, then you would assume one of the two buckets was poisoned.)
Any thoughts would be much appreciated. :)