If you want easy, try Ryuji's DS2..it's a no brainer and I use my Xtol times for Tmax and Delta exactly. Results seem better than Xtol at a fraction of the cost and effort.
For 2 liters (easier to measure than a 1 liter batch):

water 1600ml
sodium bicarbonate 2.0 g
ascorbic acid 2.0 g
metol 0.8 g
sodium sulfite, anhydrous 40 g
sodium carbonate, monohydrous 6.0 g
water to make 2.0 liters

I have lept this for a week without losing potency. All of Ryuji's published formulas work beautifully and I appreciate that he has made them available.....EC