ummm, most protein powders have roughly 1:1 ration of potassium and sodium - if your diet revolves around shakes that should be sufficient. If anything in a good diet ration of K+ to Na+ should be 2:1/3:1 -> my suggestion is: don't add any more sodium. Besides if I remember correctly you're doing some endurance training (5k in 19 mins was it?) - Potassium Citrate would do you very good, not sodium.