If you're planning a 3-month trip to China, you don't need to be fluent. You just need to focus on the most useful phrases and vocabulary.

Prioritize: greetings, asking for directions, ordering food, dealing with taxis/hotels, and emergency phrases. Pinyin is enough at this stage - you don't need to learn all characters just for travel.

Spend 30 minutes a day on the most frequent words. The resources above give you a complete structured plan that gets you conversational quickly.