我只是一次喝了喝过一次咖啡，所以没有很大的感觉。

In Chinese, frequency adverbs in sentences are usually put behind the verbs.
There are slight differences between“过” and “了”. “过” indicates a kind of experience while “了”is usually used to emphasize the time relevance to present time, such as completions or changes.
So you can also say “我只喝了一次咖啡”, but this one may cause ambiguity sometimes.

但我觉得咖啡像热可可，有苦的味道味。

虽然苦，但我喜欢喝热可可，因为加蜂蜜后，特别甜。

Or “因为加了蜂蜜后特别甜”. Both are OK.

不过我听说不能放蜜在热的饮料里放蜂蜜。

put A in B → 把A放到B里（在B里放A）
throw A to B → 把A扔向B（朝B扔A）
You can use “把”+A+verb+position structure. Or, you should put the adverbial of place before the verb generally.(But a few expressions may be hard to change in this form, like "move A to B" → 把/（将）A移到B)

它像水一样，但有稍微苦的味道点苦味（那天加了好多水）。

你们别怪我没有品茶的技能不会品茶。

Just a suggestion. The former one is also correct but kind of unnatural.

你们试试过吗？

我只是一次喝了咖啡一次，所以没有很大太多的感觉。

虽然苦，但我喜欢喝热可可，因为加了蜂蜜后，特别甜。

不过我听说不能放蜜在热的饮料里放蜂蜜。