Titrating sodium cromoglycate without wasting it?

Looking for some advice on titrating when you have a very limited supply...

I need to try this medication, but I'm so sensitive to everything, and get a tight throat with even tiny bits of basics like H1 antihistamines or DAO, so I think starting with a drop or two feels sensible...

If I start with 1 drop, can I keep the rest of the ampoule for the next few days? I've seen mixed reports about wrapping them up, fridge/no fridge etc. The leaflet says nothing about storage. (It doesn't even say you're meant to dilute it in water!) I only have 8 ampoules "to try", it was a battle to get, and getting more will take a long time if it's even possible, so I'm wondering if starting is a bad idea...

They also gave me 10 capsules to try, but again the leaflet says swallow whole, and yet I'd read it's better to dissolve them? If a solution from a capsule is more stable over a few days, maybe starting there is a better idea?