working on a water vender

that fills those 3 &5 gallon jugs.reverse osmosis system was messed up. Don't like the price on it so I changed it to decent prices..instead of 35¢ per gallon it's now $3.00 for 3 gallon and $5.00 for 5 gallon. it'll be a gift to the niece for her store..the only thing i have in it is labor. i will have her pay me 3 bucks for the stickers. comes with 10 jugs of each size that she can sell and a box of dust caps.