Any preferred milk (dairy or non-dairy), unsweetened tea (like green or hibiscus) or plain filtered water will work for the liquid.
MCT oil is a wonderful healthy fat to incorporate into your diet. If you are new to MCT oil, start out small (1 teaspoon) and gradually increase (to 1 tablespoon) to avoid digestive pain. Alternatively, you can substitute coconut oil for MCT oil.
These are my favorite stainless steel straws