what haapens to the food when it rains

Jerome describes the rain of playing havoc on their food supply:

Rainwater is the chief article of diet at supper. The bread is two-thirds rainwater, the beefsteak-pie is exceedingly rich in it, and the jam, and the butter, and the salt, and the coffee have all combined with it to make soup....After supper, you find your tobacco is damp, and you cannot smoke. Luckily you have a bottle of the stuff that cheers and inebriates, if taken in proper quantity, and this restores to you sufficient interest in life to induce you to go to bed."