Hi - I've had to take Colestryamine for 28yrs after my 2nd ileocecal resection.
Other than spacing from other medicines and roughly 12hrs (so breakfast and before bed) between doses, I haven't found timing an issue, or proximity to meals; frankly just it's lucky I remember at all, or am not too sleepy in the evening to take it at all (particularly as I'm unconsciously looking for any excuse to not do)
Personally I take one sachet in just enough water to make something gel like, like wallpaper paste, then chug it in 2 gulps, each followed by a bug swig of tea, like I'm taking horse pills. Imho theres no way to make it remotely palatable, so I take "just get it over with as quick as possible" approach.
HOWEVER about 5 years ago I started to get extreme bloating and cramps but with no white blood cell markers indicating active disease. When acid reflux symptoms (heartburn, difficulty swallowing) later added to that, I was prescribed omaprosole, which also happened to clear up the bloating and cramps.
It seems for me I now need BOTH the omaprosole to limit acid production to start with AND Colestryamine to mop up the minimised bile salts after, otherwise my bowel is extremely unhappy. Something to try, maybe?
FWIW I also eat about a litre (not all at once!) of unflavoured (but with honey) probiotic yoghurt a week to try and keep the biome happy, and I think that does also have very minor but detectable calming effect as well.
If I get all of the above just right (along with Adalimumab to keep out of remission) somedays I can almost pass for normal.