Reddit reviews Islamic Jurisprudence According to the Four Sunni Schools: Al-Fiqh 'Ala al-Madhahib al-Arba 'ah–Volume I Acts of Worship

Here is the book I have. This is only volume I but still has fiqh of all 4 Sunni schools of thought. As a side note it's about 1000 pages.

>My premise is more like if a Sunni and Shia Muslim lived together for 2 years in a college dorm, what differences would they notice day to day?

If you want to know basic differences in fiqh - you'll want to pick a comparative fiqh primer. I would suggest this one:

http://www.amazon.com/Islamic-Jurisprudence-According-Sunni-Schools/dp/1887752978

And then for Imami fiqh, I would recommend man la yadhurul faqih (you'll need to understand Arabic). This is technically a hadith book (since Shi'ites consider the words of an Imam as a hadith) but it's designed as a fiqh book. If you read them comparatively, you'll notice that Imami Shi'ites often have contradictory authentic traditions (like in nikah al mut'a or saying ameen after fatiha) where one matches a popular Sunni opinion and another is aberrant. The general logic is that the aberrant opinion is the correct one for Shi'ites and the one that matches Sunnis was said by the Imam in taqiyyah.

If you speak Urdu - which I gather from your post, see if you can find a comparative fiqh book by Mufti Abdul Kareem Mushtaq. I haven't read it so I can't comment on the content, but my understanding is he compares the majority opinion in the four madhahib of Sunnis and the major opinions of Twelver Shi'ites.

There are tons of differences though you'll notice in the minutiae if you're both religious. The basis of Imami Shi'ism was to be anti-thetical to whatever the 'aam (majority) were doing. In the case of fiqh, this translated to doing the opposite of the major school of Sunni fiqh in your city - and that became the basis for the narrations that Imamis have in their books which aren't found in the books of traditional Islamic sects (Sunnis, Zaydi Shi'ites, Ibadis, etc.)

As an example, Hur Amili said:

من جملة نعماء الله على هذه الطائفة المحقة أنه خلى بين الشيطان وبين علماء العامة، فأضلهم في جميع المسائل النظرية حتى يكون الأخذ بخلافهم ضابطة لنا

Basically, Sunni scholars were so misguided by Shaitan that it became a rule in Twelver Shi'ism to simply do the opposite of what the Sunnis did.

Hopefully that helps in whatever you're trying to study.