How to benefit from a 'single remedy' first aid kit?

Natural-health made a 20 single remedy kit, for Samantha taking into account her family's needs.  Below are her comments:

"Just a few ways the single remedies have benefitted us in the past month, since we've had them:
 

• Maurice(15yrs) had 1 dose of Phos, when the meds arrived, and has not had a nosebleed since.
   
•  Willem(husband) started a fever blister/cold sore in the morning (didn't tell me about it) and by evening it was really sore and visible.  I didn't know what to give him, but after much reading, gave 1 dose of Aconite - sudden onset infection.  By the next morning there was no sign of it.  It usually takes quite a few days of pain to go away.
   
• Dexter(17yrs) swells up terribly from bee stings, and also becomes very lethargic.  2 nights back both him and I were stung.  He had 1 dose of Apis within minutes of the sting - there was NO swelling or itching at all!  I had my dose about 30 minutes after being stung, and had no discomfort.  I was woken up the next morning with itching on the spot, had another dose - then nothing more!
   
• Dexter drilled into his index finger!  I first gave him 1 dose of Ledum; later the same day a dose of hypericum.  The next day he removed the plaster, and the finger was blue and sore.  I gave him Arnica, for bruising.  After about 5 hours he said his finger 'is still sore'.  I clarified - 'still sore' or 'sore again'?  He said - 'no, sore again'.  So the Arnica had worked.  He took one more dose.  Was fine after that.
   
• Last night I got a very painful burn from hot oil (making chips).  I usually use germolene, but all our stuff is packed already, so I looked thru my box of pills/notes and found Cantheris - sunburn, burns, blisters - and had only 1 dose!  I've had no  further pain since then!

 
That's all I can think of at the moment.  I'm really happy we made the investment in the single remedies!
 
Thanks
Sam"