Can you crush multivitamins, and how much B-12 do is needed a day?

I was wondering if multivitamins can be crushed and taken that way or if you have to just cut them in half and take them. My vitamins are all larger than a dime and I would have to cut them up and take several through out the day, I am concerned that I will not be able to drink enough water in one swallow to get them down. Also, I was wondering how much B-12 is needed. When I got my vitamins yesterday, they had pills with 500mcgs and 5000mcgs. I am thoroughly confused. I appreciate your help with this issue.

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