Hi Bifidus; just beware that 2 lemons contains at most 100 mg of vit C, probably less. What you need if cold like infections are 3-10 grams of ascorbic acid. + of course plenty of Iodine and all companions. http://whfoods.org/genpage.php?tname=foodspice&dbid=27
What I do is a mix of natural vit c like berries, oranges, limes and papaya + 2-3 grams of ascorbic acid. Works much better, been where you are.