Batch has made this recommendation:
I buy the bulk powdered vitamin C in 2 lb jar as shown below and stir two level teaspoon measures (8 grams) in 12 oz of water. I drink a gulp of this solution every two hours throughout the day until it is gone by bedtime. This is the least expensive form of vitamin C at 3 to 4 cents/gram. The liposomal vitamin C costs 8 to 9 cents/gram.