you make a mistake in dividing the parts of the sentence 可以 like the helping verb in english 放心的 like the adj or adv in english 饮用 like the verb in english 的 is not emphasize 放心， but 放心+的 makes up adv to qualify verb饮用

“的” is usually followed by a noun. Example: “他的妈妈，可爱的花儿，谁的橡皮.” “地” is usually followed by a verb Example: “用力地踢，仔细地看，开心地笑”