Bucket of Acid and Purple Soda should be called Acid Bucket and Purple Soda Bucket. For consistency. In the regular game, water and lava in a bucket aren't called Bucket of Water or Lava, but Water and Lava Buckets instead.

Not really a bug but would be nice for consistency. Wiki mentions this

If that didn't make sense then in short terms, Bucket of Acid should be called Acid Bucket and Bucket of Purple Soda, Purple Soda Bucket.