My extra tubing is just fish tank airline tubing (https://www.amazon.com/Penn-Plax-Aquariums-Flexible-Standard/dp/B0002563MW).
See this link: https://community.babycenter.com/post/a61629112/breast-pump-tubing-hack
Note, a commenter on the thread said Medela will send free replacement tubing if you don't want fish tank line, but it may still be short!
Tubing Penn Plax Airline Tubing for Aquariums –Clear and Flexible Resists Kinking, 25 Feet Standard https://www.amazon.com/dp/B0002563MW/ref=cm_sw_r_cp_apa_i_TPA3BbPN2Y0W2
Nah, never skimp out on airstones and filtration. Female bettas are solitary except in very large, heavily planted tanks, they are very aggressive fish too. High quality pellets like hikari pellets should be alternated with frozen food, my bettas usually took both. Flower pot is for a hiding cave, and ducky might be too bright and stress out the fish. Natural decor looks prettier imo than man made stuff anywho, especially if you do it right. Never use test strips, they're expensive and innacurate, liquid test kits are the better option. Basically add seachem stability to the water for as long as it says, and put fish food in to make ammonia for the bacteria to feed on. Once you hit 0 ammonia and nitrite you're good.
For filtration supplies my recommendations are: https://www.amazon.com/gp/aw/d/B000NP8W84/ref=cm_cr_othr_mb_bdcrb_top?ie=UTF8#cm_cr_carousel_images_section https://www.amazon.com/Penn-Plax-Aquariums-Flexible-Standard/dp/B0002563MW/ref=pd_aw_fbt_199_img_2?_encoding=UTF8&psc=1&refRID=T5060PXA17HMGYQ77ABQ&th=1 https://www.amazon.com/Tetra-Whisper-Easy-Aquariums-Non-UL/dp/B0009YJ4N6/ref=pd_aw_sim_199_1?_encoding=UTF8&psc=1&refRID=M73HJGY41F3HX940NJJG&th=1 https://www.amazon.com/gp/aw/d/B076S3D75C/ref=mp_s_a_1_4?ie=UTF8&qid=1539721622&sr=8-4&keywords=small+airstone&dpPl=1&dpID=41QZJrnKZZL&ref=plSrch And of course seachem prime and stability
Ah just airline tubing, like this