Wow, I have been in your exact shoes! Last year I lived with three guys who ate like horses while I was trying to save every penny. It was a total nightmare! Testing two different ways was quite the journey. First, going full nerd led to a custom Google Sheet for importing the Walmart CSV data. It sounded fantastic but the technical reality was a mess because Walmart changes their item descriptions constantly... one week it is Great Value Milk and the next it is just GV MLK. The formatting is so unreliable for exports! Then the Splitwise itemized scan seemed like a fix. It is seriously amazing for speed, but I am super cautious about the math. Sometimes it misses the delivery fee or glitches on the tax! Ngl, I eventually just went back to the old school method of highlighting a digital receipt. It is the only way to be 100% sure you dont end up paying for someone elses soda!

Honestly, trying to automate Walmart receipt scraping is a total dead end. Their digital receipt formatting is a nightmare to parse, and third-party receipt scanners are unfortunately not as good as expected when it comes to line-item tax distribution. I had issues with almost every OCR tool out there because they fail to calculate the mixed tax rates correctly. The quickest fix is managing this at checkout. Just use the shared cart feature in the Walmart app. Have everyone add their own items, and take screenshots of the individual subtotals before you actually place the order. For shared items like paper towels, just split that specific amount evenly at the end. It is way easier than trying to untangle the giant lump sum afterwards.