I filled from a bottle, even during exams. My professor teased me a bit, sometimes I had to refill twice because those bluebooks were thirsty. I used a Lamy Vista which is still my main pen 15 years later. My favorite ink was noodlers Zhivago. It's a green so dark it's almost black, but you can still barely tell it's green. Black enough to be accepted, but I was also warned by TAs it made it impossible to grade my papers anonymously.