Brenda,
Don't take fenugreek now as you are already having fever which might be due to engorgement. Having engorgement actually mean that you have a lot of milk in your breast which cannot come out and so ended up having fever. If you take fenugreek now, you will make the engorgement worst. Now you should work on how to get the milk out your breats 1st, by massaging and make the milk ducts open fully and empty your breats until it bacome really soft. Then only you can take fenugreek to boost supply further.
About water intoxication, a bit of water will not cause water intoxication. For those bb who is being admitted for phototherapy in TMC, the nurse there will feed your bb water (about 90ml a day), your bb still come home safely without any water intoxication right?
I total breastfeed my #1 and she was fed water (less than 60ml a day), she grew up fine.