Try your pharmacist as everyone suggested. Explain you need a syringe without a needle, they may give you one. Here in NC they will give you a few, but I usually just order some off ebay - I get 100 for around $12 including shipping (12¢ each!). Sounds like a bunch of syringes, but you will...
You can use either one to treat tapeworms.
Dosing information is in the first post of this thread:
https://www.backyardchickens.com/threads/treating-tapeworms-under-construction.1220309/#post-19519143