Breastfeeding Woes!!! Help!!!

Hi! I'm 2weeks PP and I seem to have an erratic amount of milk? Some mornings both boobs are so engorged I can't wait for my son to feed.. but there are days when he can't seem to get the milk he needs. Is this normal?

Also I think he might be going thru a growth spurt now? He wants milk almost every hour! Is that normal or is my milk supply dwindling?

I take Legendairy Milk supplements and about 4L of water daily... should I do more? I've heard of power pumping but won't that make my son even more fussy if he can't get any milk when he wants? (i don't think my refill is fast enoughX how do I know how fast my boobs fill up again after they've been emptied?? Haha)