Plastic bottles may be placed around the pitch, a metre from the touchlines, as long as they do not interfere with the assistant referees.
It adds: "Rules must be observed so as to avoid disorderliness on the field and possible injury from objects such as bottles being thrown around."
Former England centre-half Jack Charlton told Five Live Sport the issue was a serious one.
Charlton was Republic of Ireland manager at the 1994 World Cup in USA when he clashed with officials trying to get water to his players on the pitch.
"Players are running about in an enclosed stadium in temperatures when normal people would go and stand under some shade. They are sweating and it is hard work for them," said Charlton.
"In 1994 Fifa sent Ireland a letter saying if the players did not have water in the temperatures they were playing in, then they were likely to go into a coma from which they were liable not to recover."
Meanwhile, a leading German weather forecaster has boosted England by saying Thursday's game with Trinidad & Tobago, which kicks off three hours later at 1700 BST, will be played in much cooler temperatures.
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It would be a killer having the roof closed above, with the massive crowds inside
German weather forecaster Joerg Kachelmann
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"There will be showers and maybe thunderstorms during the day," said Joerg Kachelmann. "Thursday will be the first cool day of the week."
However, the situation could worsen as Fifa has indicated the roofs on some World Cup stadiums may be closed to help eradicate distracting shadows being cast on the pitch.
Director of Communications Markus Siegler said television images were being spoilt by the distinctive shadows caused by stadium design, roof girders or other structures.
But Kachelmann warned: "It would be a massive greenhouse inside if they close the roofs, with temperatures rising well above 30 degrees."
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Interview: former England player Jack Charlton
