The fluid chart is attached.
You want to rehydrate the patient so giving a litre over 2 hours and then re-assessing the patient seems reasonable
You give 3 litres over the next 24 hours, because of the borderline low NA you use normal saline for this with 40 mmol of potassium in each litre. You do NOT put the K in the initial resuscitation bag as this will exceed 10mmol/hr
If you feel the patient needs to have potassium replaced more quickly than that then you may need to admit the patient to critical for central venous access and cardiac monitoring.
Are you going to give any instructions to the nursing staff??
In order to get some prescribing resources out there we intend to publish a series of prescribing problems on the website. The problems will appear at least weekly with the "answers" appearing a couple of days later. We'll use the standard exam stationery available on the LSE, but also available below in case you haven't got access to the LSE.