You can use warm water. You can also add wheatgrass juice to the water. Acidophilus and bifidus powder can help too. You can buy the capsules and open them and put the powder in the water. This will help to reestablish the good bacteria in your colon so that you immune system gets stronger. As you are giving yourself the enema massage your abdomen, this will help to water to go deep into your colon to get out the bad stuff and blockages.
It's great that you drank apple juice but I would highly suggest fasting on organic apple juice or eating only organic apples and cucumbers for 3 days. You will effectively clean out your kidneys this way. Other foods will get in the way of cleaning out your kidneys. Also it is a good idea to drink atleast 5 cups of detox tea during the day that you are doing your flush along with a lot of water. Hope this helps.