In general if people are looking to donate money the most effective ways is through organisations that already have an infrastructure in the crisis area, like UNICEF & International Red Cross
purely because to buy here and then ship adds shipping costs. At the moment supplies can also be bought directly in Poland and border countries by the above type of organisations. They
just need the money to do it. It is not clear if this will always be the case as refugee numbers increase! Unfortunately, I have a feeling that all resources will get overwhelmed.