Prayer For The Ill

A friend of mine who is physically ill wants me to do a "blessing over them." They are ill the the sense that they just had a stroke and are in rehab basically. What would be the appropriate thing to do in this case in terms of enacting a blessing on someone?

Aside from physically purifying the individual in person, you might make an offering for his or her recovery, or dedicate an ex-voto for the purpose.