Yihetang and snail powder are common drinks and delicacies in China, and people often enjoy them together. In this context, "drinking Yihetang and eating snail powder with you" represents the scene of sharing food and enjoying time with friends or relatives. If the "I" in this sentence refers to the speaker himself, then the meaning of this sentence may be to express the sense of loss that I can't enjoy with you, implying the desire to spend time with you.
This sentence can also be seen from another angle, which may imply the expectation and desire for you. If this sentence is said on a specific occasion, such as a party or a date, then this sentence may be an expression of expectation and desire to get along with you. Generally speaking, the meaning of this sentence depends on the specific situation and the speaker's emotional expression.