All you really need are https://www.amazon.com/Miko-Awase-Soyabean-Paste-Japanese/dp/B000N1LF96/ref=sr_1_1?keywords=mixed+miso&qid=1639859244&sr=8-1

and https://www.amazon.com/Ajinomoto-Hondashi-Bonito-Stock-Packs/dp/B07PDVBV3F/ref=sr_1_4?keywords=hondashi&qid=1639859287&sr=8-4

but you may also want to buy wakame seaweed and add your own soft tofu, green onions, or other vegetables.

Recipe: https://pickledplum.com/japanese-miso-soup-recipe/