Are there any other sources of microplastics, or is it just water?

Intuit and H&R Block has had their hands in too many lawmaker pockets. The IRS knows exactly how much you earn from reported sources. I see no reason why they cannot send you (physical or electronic) a first draft, let you make any changes, and submit your return. This also gives tax-dodgers a fun notice of "hey! here's what we think you owe".