from what people say, ketostix arent that reliable and also arent necessary.
The colour can change depending on a lot of things.. for isntance if you have a large capacity bladder
and can hold a lot of wee, then their will be more ketones which might show as darker.
First thing in the morning its usually darker.
If you have a lot of fluids quickly that goes straight through the ketones can appear very diluted.
As long as you are having the recommended amount of water and drink more if you feel thirsty, then I wouldnt fret,
Don't try to force loads of water in to get the colour to change as if you have had 3 ltres water you are prob not dehydrated,
Just drink more if you feel you need.
And you dont need to keep testing as it is just one more thing to worry about!
x