Possible to increase amount of "cum" during ejaculation? Tried drinking more water than usual to no avail. Want a load like peter north..

Not Really. The amount of ejaculate will vary from person to person, how long it has been since they last ejaculated, their health, prostate and musculature function, etc. "cum" shots in porn films are not realistic, may using multiple shots/views spliced together, artificial means, and stand-ins. Porn tends to select out those that fit outside the norm in size or amount of ejaculate. It's not reality tv.
Yes. Volume depends on factors: time between ejaculations (3 days is optimal), duration of stimulation before orgasm (longer is better), level of stimulation at time of orgasm, and finally the unchangeable nature and variability between people.