The best I could do was 44 hours. I'm to unfit to be fastin…

I was 300lbs 2 years old, down to 230lbs you can do it.

wow, great job

Check out "dry fasting".
It is said, that one day dry fasting is equivalent to three days water fasting.
Did it two times for about 48 hours.
I normally stop drinking at evening and then I try to keep it going as long as possible the next day and the day after.
Main problem is actually sleep deprivation since the body is in som ekind of survival mode and sleeping is really really hard^^.