Eradicating Powdery Mildew during 3rd week of flowering

started seeing powdery mildew appear on the lower set of stems. Have not seen any on the leaves themselves but a snipped off some stems that had the mildew. What is the best way to deal with this considering my plants are in the flower stage? if I use fungus bombs, could I use them in the room, with my plants remaining in there? what are your thoughts on neem oil? where can I get some? how should I apply. Please lend me your suggestions. The problem isn't really bad (yet) but I know this can get out of control very easily. Thank you.View attachment 1963453View attachment 1963454