Help How To Dose K2SO4 in 10g tank

[Django]

Hi. I just got some dry K2SO4 powder to treat a Potassium deficiency in some of my plants. I read the sticky but got a little confused with the numbers.

I can use a 1-liter soda bottle to mix the Potassium with distilled water (or if you know something better...) I'm just not sure about the rest of the nummbers for my 10g.

I've got roughly 2-3" substrate and 1/2" down surface down from plastic edge.

Thanks lots for the help.