Your biggest exposure is going to be water, hands down. What you store it in, how you filter it, these are going to be major sources of plastics and pfas.
I wonder why do you think that? According to the website, unfiltered tap water is not really bad. Am I missing something?
Yes and PFAS/PFOS is now getting directly linked to rise in colorectal cancers.
Personally I would prioritize water filtering for PFAS over microplastics worries if you have limited budget to start changing consumption patterns.