Need elderberry option for kids camp- pill? Gummy? Powder? ?

[matrips]

I make elderberry syrup which the kids and I take daily.  However, one teen ds willl be staffing an encampment after Christmas for 10 days.  I really want him to be able to keep up with elderberry and reduce the chance of getting down sick.

Is there an elderberry something that would be as strong as the syrup?  And yet be in capsule, pill  or gummy form or even single packs of powder that will be easy to use and store at camp?  

I heard some of the gummies/lozenges aren’t very potent.  And I’m not sure how to tell what would be worthwhile. He might only get a chance to take something once a day so hoping for something as strong as the syrup.

[matrips]

Bumping.  Anyone?

[mlktwins]

My boys have used the Sambucol gummies and they worked very well for them.  They are expensive long term, but great for trips, etc.