please... piss on ur plants. That doesnt sound good to me. if you use good quality soil you should get two or three weeks out of it, then use 1ml of the grow fert seen below. There are three products below,

Topmax Bloom Stimulater, Bio-bloom Liquid Plant Food, Bio-Grow they cost about £10 each for 1ltr, Ive had amazing results using them.

there organic and worth there weight in gold, and you wont av to piss in a pot.

if you want i can give you the feeding schedule.