If you eat dinner at 8:30 and you can take the capsules at 8 PM and be fine. It doesn't have to be exactly 12 hours apart. Humaworm said 8 to 12 hours is ok.
Look for fruits or vegetables in season...they are all so expensive now. Frozen fruits or veggies would be an alternative. 1/2 cup is a serving. Not good to be feeling bad at the same time you are out of work!
Epsom salt is really cheap... like a dollar or two.
Maybe you should get one of those pitcher filters or faucet filters for your water... You can boil regular water for 5 minutes, and let it cool before drinking, too. That is supposed to help it.