Spaghetti noodle issues
Liberal amounts of olive oil is a must. I'm not so sure about the idea of adding hot water to the precooked pasta. It is usually the other way around.

Some italian restaurants will pre-cook pasta al dente before the meal time rush, drain it, mix it with olive oil and then will dip it back into boiling water for a minute before draining and serving.

https://www.bonappetit.com/test-kitchen/cooking-tips/article/make-ahead-pasta