As rhino says, coffee ground can make your pH sky rocket... same with alot of home made ferts..
If you have room outside,,start a compost pile,,
Bird poo is high in all npk,and trace elements..but isnt very sterile and is hard to collect. Rabbit poo, dryed,boiled and strained. say 15-20 pellets.POO. the 'tea' is what you use, start dilute, 1 part tea to 6 part water. Once a week, is High in N and has P,K, and trace elements, in different ratios depending on rabbits diet. Is hard to get in large quainties,I use as veg Fert. and for week in flower,,only on one plant and she is the strongest of the four!!!!!
I know of people who pee in bottle,has to be first pee in moring, then dilute 1 part to 5 parts water, it ultra high in N, with what ever else you have been eating,./
That will also mess with the ph, try mixing dolimte lime in,small amounts of epsom slats or bi carb soda... or as small top dressing to help blance that ph,/
All homemades will mess with the ph and depending on your soil and your dilutions. Alwasys always start with small dilute amounts and build up, and leach the soil atleast once a month if the plants in there for mre than that amount of time.
Is it organic ferts you are looking for ?? or cheap homemade stuff.
# take it easy... and Hope that helps